Complex sentence: They are ambushed by Rat Creatures, but Thorn finds them and fights the Rat Creatures off, the Rats terrified to discover that she and the Bones were the ones who wounded Kingdok.
Split into simpler sentences: They are ambushed by Rat Creatures, but Thorn finds them and fights the Rat Creatures off. The Rat Creatures are terrified to discover that she and the Bones were the ones who wounded Kingdok.