Complex sentence: He reattaches his severed hand and reveals that he wants eternal life because he doesn't want to die and that he wants revenge on the wizards of Earthsea and Roke for banishing him for trying to control the dead and become Archmage himself.
Split into simpler sentences: He reattaches his severed hand and reveals that he wants eternal life because he doesn't want to die. He wants revenge on the wizards of Earthsea and Roke for banishing him for trying to control the dead and become Archmage himself.