Complex sentence: McCain has chaired the Senate Commerce Committee, opposed pork barrel spending, and played a key role in alleviating a crisis over judicial nominations with the bi-partisan group known as the Gang of 14.
Split into simpler sentences: McCain has chaired the Senate Commerce Committee, and he opposed pork barrel spending. He also played a key role in alleviating a crisis over judicial nominations with the bi-partisan group known as the Gang of 14.