Complex sentence: Barboza was expected to face Evan Dunham on May 26,2012 at UFC 146, but Dunham dropped out of the bout due to injury and will be replaced by returning veteran Jamie Varner.
Split into simpler sentences: Barboza was expected to face Evan Dunham on May 26,2012 at UFC 146. However, Dunham was forced out of the bout with an injury and replaced by returning veteran Jamie Varner.