Extract Text between two commas

select MemberGroupLangStr,
CASE
-- when no second semi-colon,
WHEN CHARINDEX(',',(SUBSTRING(MemberGroupLangStr,CHARINDEX(',',MemberGroupLangStr,1)+1,99))) = 0
-- then extract the full string from first semi-colon to the max length of 99
THEN LTRIM(RTRIM(SUBSTRING(MemberGroupLangStr,CHARINDEX(',',MemberGroupLangStr,1)+1,99)))
-- else extract the full string from the first semi-colon up to second semi-colon
ELSE LTRIM(RTRIM(SUBSTRING(
/* > */ MemberGroupLangStr,
/* */ CHARINDEX(',',MemberGroupLangStr,1) + 1,
/* */ CHARINDEX(',', SUBSTRING(MemberGroupLangStr,
CHARINDEX(',', MemberGroupLangStr, 1) + 1,
99)) - 1
) ) )
END AS Result_string
From MembersWithUnapprovedTextAttributes