Complex sentence: Lorenzen was working as the GM of the Northern Kentucky River Monsters of the Ultimate Indoor Football League when he decided to return to football, despite being well over 300lbs out the time and resigned as GM to become the teams starting quarterback.
Split into simpler sentences: Lorenzen was working as the GM of the Northern Kentucky River Monsters of the Ultimate Indoor Football League when he decided to return to football. Despite being well over 300lbs at the time, Lorenzen resigned as GM to become the teams starting quarterback.