# the leaders of Israel ... the heads of their ancestor's families

These two phrases describe the same group of people two different ways. AT: "the leaders of Israel who are also the heads of their ancestors families" (See: [[rc://en/ta/man/translate/figs-parallelism]])

# the heads of their ancestor's families

Here the leaders of the families are referred to as "heads." AT: "the leaders of their ancestor's families" (See: [[rc://en/ta/man/translate/figs-metonymy]])

# had overseen the counting of the men

The abstract noun "counting" can be stated as a verb. AT: "had helped Aaron and Moses to count the men" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])