Complex sentence: Roth is one of the most awarded U.S. writers of his generation: his books have twice received the National Book Award, twice the National Book Critics Circle award, and three times the PEN/Faulkner Award.
Split into simpler sentences: Roth is one of the most award-winning U.S. writers of his generation. His books have twice received the National Book Award, twice the National Book Critics Circle award, and three times the PEN/Faulkner Award.