Complex sentence: At the end of the 2008 NFL regular season, longtime head coach Mike Shanahan was fired and replaced by Josh McDaniels; due to the uncertainty, Bates began looking for a new position.
Split into simpler sentences: At the end of the 2008 NFL regular season, longtime head coach Mike Shanahan was fired and replaced by Josh McDaniels. Due to the uncertainty, Bates began looking for a new position.