Complex sentence: Hewitt, a quadriplegic invalid, wished to use the data he'd gathered to repair his damaged body and eventually used it to transform himself into the villain known as "Tokamak, the Living Reactor".
Split into simpler sentences: Hewitt, a quadriplegic invalid, wished to use the data he'd gathered to repair his damaged body. He later used the data he'd gathered to transform himself into the villain known as "Tokamak, the Living Reactor".