Complex sentence: He then takes the hose, and plays a trick on Pinga by making her believe that the snowman is speaking to her, and a similar trick on Robby by making him believe that a fish is speaking to him.
Split into simpler sentences: He then takes the hose and plays a trick on Pinga by making her believe that the snowman is speaking to her. He plays a similar trick on Robby by making him believe that a fish is speaking to him.