Complex sentence: The boy wishes to take the Rabbit with him, but his doctor forbids him to take the germ-laden toy and says it must be burned along with all the nursery toys in order to disinfect the nursery.
Split into simpler sentences: The boy wishes to take the Rabbit with him, but his doctor forbids him to take the germ-laden toy. Not only can he not take the Rabbit, but the doctor says it must be burned along with all the nursery toys in order to disinfect the nursery.