en_tn/1ch/03/04.md

where he reigned seven years and six months

This can also be translated as a separate sentence: "David reigned there seven years and six months."

thirty-three years

"33 years" (See: rc://en/ta/man/translate/translate-numbers)

Ammiel ... Shammua ... Shobab ... Nathan

These are names of men. (See: rc://en/ta/man/translate/translate-names)