Complex sentence: Captive oscars may be fed prepared fish food designed for large carnivorous fish, crayfish, worms, and insects such as flies or grasshoppers.Then even eat small mice, crickets are also good live food.
Split into simpler sentences: Captive oscars may be fed prepared fish food designed for large carnivorous fish, crayfish, worms, and insects such as flies or grasshoppers. They even eat small mice, and crickets are also good live food.