en_tn/jos/21/20.md

the Kohathite clans

The priests in this group were descendants of Levi's son Kohath. A portion of them were also descendants of Aaron, Kohath's grandson. (See: rc://en/ta/man/translate/translate-names)

they had cities given to them

This can be stated in active form. AT: "they received cities" (See: rc://en/ta/man/translate/figs-activepassive)

casting of lots

A random method of choosing to remove the choice from the leader's will, often done with the idea that God will decide the outcome. See how you translated this in Joshua 19:1.