Complex sentence: Subsequent to Flatiron, Colonna was with JPMorgan Chase, and he was named co-Executive Director of NYC2012, an organization representing New York City in the competition to host the 2012 Olympic Games.
Split into simpler sentences: Subsequent to Flatiron, Colonna was with JPMorgan Chase. He was named co-Executive Director of NYC2012, an organization representing New York City in the competition to host the 2012 Olympic Games.