Complex sentence: A 2011 list by the marketing firm Nielsen ranked Rivera as the second-most marketable player in baseball; the list accounted for personal attributes such as sincerity, approachability, experience, and influence.
Split into simpler sentences: A 2011 list by the marketing firm Nielsen ranked Rivera as the second-most marketable player in baseball. The list accounted for personal attributes such as sincerity, approachability, experience, and influence.