Complex sentence: No one believes him until Pinocchio makes donkey-Lampwick kick Lorenzini sending him into the fountain's pool, and as Lorenzini gets out of the fountain and jumps in a river, he transforms into a "monster".
Split into simpler sentences: No one believes him until Pinocchio makes donkey-Lampwick kick Lorenzini, sending him into the fountain's pool. As Lorenzini gets out of the fountain and jumps in a river, he transforms into a "monster".