Complex sentence: After Rumbo and Bella both die, Rumbo died when trying to save Fluke from some scientists and Bella died of old age and poor conditions, he seeks out his wife (Nancy Travis) and son (Max Pomeranc) and reunites with them as their dog.
Split into simpler sentences: After Rumbo and Bella both die, Rumbo died when trying to save Fluke from some scientists and Bella died of old age and poor conditions. He seeks out his wife (Nancy Travis) and son (Max Pomeranc) and reunites with them as their dog.