Complex sentence: This event was expected to feature Light Heavyweight Champion Jon Jones' first title defense against former Light Heavyweight Champion Rashad Evans, but a pre-existing injury in his right hand, which was expected to keep him sidelined until late 2011 delayed the fight.
Split into simpler sentences: This event was expected to feature Light Heavyweight Champion Jon Jones' first title defense against former Light Heavyweight Champion Rashad Evans. But a pre-existing injury in his right hand, which was expected to keep him sidelined until late 2011 delayed the fight.