How about something like
DECLARE @TABLE TABLE(
LoginID NVARCHAR(MAX),
Team nvarchar(max)
)
INSERT INTO @TABLE values
('kbcg','Administrator,Teacher,Student'),
('kbc','Admin,Teacher,Principal')
;WITH Vals AS (
SELECT LoginID,
CAST('<d>' + REPLACE(Team, ',', '</d><d>') + '</d>' AS XML) XMLCol
FROM @TABLE
)
SELECT Vals.LoginID,
B.value('.','NVARCHAR(MAX)') Team
FROM Vals CROSS APPLY
XMLCol.nodes('/d') AS A(B)