Complex sentence: Mills signed with the Wilkes-Barre/Scranton Pioneers of the af2, a minor league of the Arena Football Leaguein the Spring of 2007 but left the team a few weeks later to pursue a profession in sales.
Split into simpler sentences: Mills signed with the Wilkes-Barre/Scranton Pioneers of the af2, a minor league of the Arena Football League. But left the team a few weeks later to pursue a profession in sales.