Prose
S. B. U. II. 13
In plain words
There is nothing to translate here: this is a citation marker from the printed page, not a line of Sankara's Sanskrit -- a stray fragment of the book's own reference apparatus ('S. B. U., II.13') rather than a verse or a piece of commentary.
Close to the Sanskrit
This is not a Sanskrit sentence. It is a printed-edition page or section citation -- an abbreviated cross-reference marker (apparently 'S. B. U.', part/chapter II, section 13) -- that has been caught in the pending queue as a print artifact rather than as bhasya prose.