Complex sentence: Since its opening, the arena has hosted many boxing events, the first boxing event was on November 28,2008 with two fights, Chris Arreola vs. Travis Walker and Paul Williams vs. Verno Phillips.
Split into simpler sentences: Since its opening, the arena has hosted many boxing events. The first boxing event was on November 28,2008 with two fights, Chris Arreola vs. Travis Walker and Paul Williams vs. Verno Phillips.