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You can use query below:

DECLARE @Sentence    VARCHAR(MAX) = 'The quick brown fox jumps over the lazy dog'

SELECT SUBSTRING(@Sentence, 1, CHARINDEX(' ', @Sentence) - 1) AS [First Word],
       REVERSE(SUBSTRING(REVERSE(@Sentence), 1, CHARINDEX(' ', REVERSE(@Sentence)) - 1)) AS [Last Word]

First Word   Last Word
------------ -----------
The          dog