Complex sentence: Not all animals have to be rewilded before being reintroduced back into the wild, as a general rule, captive carnivores unlike herbivores have to be rewilded before they can be released.
Split into simpler sentences: Not all animals have to be rewilded before being introduced back into the wild. As a general rule, captive carnivores, unlike herbivores, have to be rewilded before they can be released.