Complex sentence: When Master Fung becomes trapped in the Ying-Yang world, Omi asks for help from Chase; he succeeds in rescuing Master Fung, but upon leaving the Ying-Yang world, his bad chi takes over and he joins the Heylin side.
Split into simpler sentences: When Master Fung becomes trapped in the Ying-Yang World, Omi asks for help from Chase. He succeeds in rescuing Master Fung; however, upon leaving the Ying-Yang world, his bad chi takes over and he joins the Heylin side.