John Gill Commentary 2 Samuel 5:13

"And David took him more concubines and wives out of Jerusalem, after he was come from Hebron; and there were yet sons and daughters born to David." — 2 Samuel 5:13 (ASV)

And David took [him] more concubines and wives out of
Jerusalem, after he was come from Hebron
He had six when he was at Hebron, (2 Samuel 3:2–5) , and now he took more, which was not to his honour, and contrary to the law of God, (Deuteronomy 17:17) ; the concubines were a sort of half wives, as the word may signify, or secondary ones, and under the others:

and there were yet sons and daughters born to David ;
besides those in Hebron mentioned in (2 Samuel 3:2–5) .