en_tn_lite_do_not_use/jos/21/39.md

The clans of Merari were also given Heshbon

This can be stated in active form. AT: "The clans of Merari also received Heshbon" (See: rc://en/ta/man/translate/figs-activepassive)

Heshbon ... Jazer

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

twelve cities in all

"12 cities in total" (See: rc://en/ta/man/translate/translate-numbers)

twelve cities in all were given to them by the casting of lots

This can be stated in active form. AT: "they received these twelve cities by the casting of lots" (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.