Complex sentence: He is reincarnated as Lü Dongbin and serves as the team leader, but has to overcome his romantic entanglements with Peony Fairy because romance between immortals is forbidden by Heaven's laws.
Split into simpler sentences: He is reincarnated as Lü Dongbin and serves as the team leader. However, he has to overcome his romantic entanglements with Peony Fairy because romance between immortals is forbidden by Heaven's laws.