en_tn/2ch/35/10.md

the service was prepared

This can be translated in active form. Alternate translation: "they prepared everything they needed so they could perform the Passover" (See: rc://en/ta/man/jit/figs-activepassive)

their divisions

the groups into which the people had divided the priests and Levites. See how you translated this in 2 Chronicles 35:4.