SQL Server 2017

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CREATE FUNCTION [dbo].[DelimitedSplit8K] (@pString VARCHAR(8000), @pDelimiter CHAR(1))
--WARNING!!! DO NOT USE MAX DATA-TYPES HERE!  IT WILL KILL PERFORMANCE!

RETURNS TABLE WITH SCHEMABINDING AS
RETURN

/* "Inline" CTE Driven "Tally Table" produces values from 1 up to 10,000... enough to cover VARCHAR(8000)*/

WITH E1(N) AS (
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
                 SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
                ),                          --10E+1 or 10 rows
       E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
       E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
 cteTally(N) AS (--==== This provides the "base" CTE and limits the number of rows right up front
                     -- for both a performance gain and prevention of accidental "overruns"
                 SELECT TOP (ISNULL(DATALENGTH(@pString),0)) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
                ),
cteStart(N1) AS (--==== This returns N+1 (starting position of each "element" just once for each delimiter)
                 SELECT 1 UNION ALL
                 SELECT t.N+1 FROM cteTally t WHERE SUBSTRING(@pString,t.N,1) = @pDelimiter
                ),
cteLen(N1,L1) AS(--==== Return start and length (for use in substring)
                 SELECT s.N1,
                        ISNULL(NULLIF(CHARINDEX(@pDelimiter,@pString,s.N1),0)-s.N1,8000)
                   FROM cteStart s
                )
--===== Do the actual split. The ISNULL/NULLIF combo handles the length for the final element when no delimiter is found.
 SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY l.N1),
        Item       = SUBSTRING(@pString, l.N1, l.L1)
   FROM cteLen l

DECLARE @TableData as table (
    DeliveryExtension nvarchar(260), ExtensionSettings ntext
    )

INSERT INTO @TableData VALUES
    ('Report Server Email', '<ParameterValues><ParameterValue><Name>TO</Name><Value>name.one@companyinc.com; name.two@companyinc.com; name.3@companyinc.com</Value></ParameterValue><ParameterValue><Name>CC</Name><Value>name.four@companyinc.com; name.five@companyinc.com</Value></ParameterValue><ParameterValue><Name>IncludeReport</Name><Value>True</Value></ParameterValue><ParameterValue><Name>RenderFormat</Name><Value>EXCELOPENXML</Value></ParameterValue><ParameterValue><Name>Subject</Name><Value>@ReportName was executed at @ExecutionTime</Value></ParameterValue><ParameterValue><Name>Comment</Name><Value>Any undefined category is currently being addressed.</Value></ParameterValue><ParameterValue><Name>IncludeLink</Name><Value>False</Value></ParameterValue><ParameterValue><Name>Priority</Name><Value>NORMAL</Value></ParameterValue></ParameterValues>')
    ,('Report Server Email', '<ParameterValues><ParameterValue><Name>TO</Name><Value>name.one@companyinc.com; name.two@companyinc.com</Value></ParameterValue><ParameterValue><Name>CC</Name><Value>name.three@companyinc.com</Value></ParameterValue><ParameterValue><Name>IncludeReport</Name><Value>True</Value></ParameterValue><ParameterValue><Name>RenderFormat</Name><Value>EXCELOPENXML</Value></ParameterValue><ParameterValue><Name>Subject</Name><Value>@ReportName was executed at @ExecutionTime</Value></ParameterValue><ParameterValue><Name>Comment</Name><Value>@ReportName

If there any issues with this report please open a ticket for Reporting Services Portal support.</Value></ParameterValue><ParameterValue><Name>IncludeLink</Name><Value>False</Value></ParameterValue><ParameterValue><Name>Priority</Name><Value>NORMAL</Value></ParameterValue></ParameterValues>')
    ,('Report Server FileShare', '<ParameterValues><ParameterValue><Name>PATH</Name><Value>\\network1234\c$\temp</Value></ParameterValue><ParameterValue><Name>FILENAME</Name><Value>AE Points Report</Value></ParameterValue><ParameterValue><Name>FILEEXTN</Name><Value>True</Value></ParameterValue><ParameterValue><Name>USERNAME</Name><Value>OCSgOkfVICihDFLe9g/oVGCa86jtJJLh2vqiuOYEvtYL1kudnJ6RuGqXlMpxqDz9</Value></ParameterValue><ParameterValue><Name>PASSWORD</Name><Value>f0zrUzblRan6Q9h9iW8FwevA9UKSo3guHz79rx3XG9i+OdAj3LxLaf659MJT0ZjE</Value></ParameterValue><ParameterValue><Name>RENDER_FORMAT</Name><Value>EXCELOPENXML</Value></ParameterValue><ParameterValue><Name>WRITEMODE</Name><Value>Overwrite</Value></ParameterValue><ParameterValue><Name>DEFAULTCREDENTIALS</Name><Value>False</Value></ParameterValue></ParameterValues>')

;with cte as(
select 
    DeliveryExtension 
    , ExtensionSettings
	, x.ItemNumber
	, x.Item
from @TableData
cross apply dbo.DelimitedSplit8K(replace(replace(replace(replace(replace(cast(ExtensionSettings as varchar(max)),'<ParameterValue>',''),'</ParameterValue>',''),'<ParameterValues>',''),'</Name>',''),'</Value>',''),'<Name>') x
where x.Item != '')

select 
	c.DeliveryExtension
	,[TO] = max(replace(t.Item,'Value>',''))
	,[CC] = max(replace(cc.Item,'Value>',''))
	,[Format] = max(replace(form.Item,'Value>',''))
from cte c
left join cte t on 
	t.ItemNumber = c.ItemNumber + 1
	and cast(c.ExtensionSettings as varchar(max)) = cast(t.ExtensionSettings as varchar(max))
	and c.Item = 'Name>TO'
left join cte cc on 
	cc.ItemNumber = c.ItemNumber + 1
	and cast(c.ExtensionSettings as varchar(max)) = cast(cc.ExtensionSettings as varchar(max))
	and c.Item = 'Name>CC'
left join cte form on 
	form.ItemNumber = c.ItemNumber + 1
	and cast(c.ExtensionSettings as varchar(max)) = cast(form.ExtensionSettings as varchar(max))
	and c.Item in ('Name>RenderFormat','Name>RENDER_FORMAT')
group by
	c.DeliveryExtension, cast(c.ExtensionSettings as varchar(max))

DeliveryExtension	TO	CC	Format
Report Server FileShare	null	null	EXCELOPENXML
Report Server Email	name.one@companyinc.com; name.two@companyinc.com; name.3@companyinc.com	name.four@companyinc.com; name.five@companyinc.com	EXCELOPENXML
Report Server Email	name.one@companyinc.com; name.two@companyinc.com	name.three@companyinc.com	EXCELOPENXML

Warning: Null value is eliminated by an aggregate or other SET operation.