This can be stated in active form. Alternate translation: "the priests should use these animal sacrifices to cleanse what are copies of things that are in heaven" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-explicit]])
That is, better than the sacrifices used to cleanse the earthly copies. This can be stated in active form. Alternate translation: "as for the heavenly things themselves, God had to cleanse them with much better sacrifices" (See: [[rc://en/ta/man/translate/figs-activepassive]])