en_tn_condensed/1ch/24/04.md

they divided

"David, Zadok, and Ahimelech divided"

sixteen groups

"16 groups" (See: rc://en/ta/man/translate/translate-numbers)

heads of clans

Here "heads" is a metaphor for the more important people—the leaders of the clans. AT: "leaders of the clans" (See: rc://en/ta/man/translate/figs-metaphor)

These divisions were eight in number, corresponding to their clans

"There were 8 divisions based on the clans of Ithamar's descendants"