Complex sentence: Grodd attempts to use his mind-control ability on Lex, but Luthor had anticipated this and turns Grodd's own power back on himself, giving Luthor control of Grodd.
Split into simpler sentences: Grodd attempts to use his mind-control ability on Lex. However, Luthor had anticipated this and turns Grodd's own power back on him, giving Luthor control of Grodd.