Complex sentence: Rick finds Imhotep summoning the Scorpion King and fights him, but suddenly, the Scorpion King interrupts them, and Imhotep lies to him that Rick was sent to kill him.
Split into simpler sentences: Rick finds Imhotep summoning the Scorpion King and fights him. The Scorpion King interrupts them, and Imhotep lies to him that Rick was sent to kill him.