This can be stated in active form. Alternate translation: "let people and animals wear sackcloth" or "let people cover themselves and their animals with sackcloth" (See: [[rc://en/ta/man/jit/figs-activepassive]])
"pray earnestly to God." What they were to pray for can be made explicit. Alternate translation: "cry out loudly to God and ask for mercy" (See: [[rc://en/ta/man/jit/figs-explicit]])