Complex sentence: They help the pups escape by using a sort of seesaw which the pups made: one pup would be on one side while one of the shepherds would jump onto the other so that the pups would fly away.
Split into simpler sentences: They help the pups escape by using a sort of see-saw which the pups made. The pup would be on one side while one of the shepherds would jump onto the other so that the pups would fly away.