Complex sentence: He was voted by his fellow players as the Most Valuable Player, a remarkable award considering he played most of the season with complications from appendicitis, and gave credence to the claim that he was one of the toughest players in the NFL.
Split into simpler sentences: He was voted by his fellow players as the Most Valuable Player, which is truly remarkable considering he played most of the season with complications from appendicitis. This toughness gave credibility to the claim that he was one of the toughest players in the NFL.