Complex sentence: On May 23,2009 in Las Vegas, Nevada, Mir was scheduled to fight Brock Lesnar at UFC 98, however Mir sustained a knee injury during training which required arthroscopic surgery and the removal of bone chips from his knee.
Split into simpler sentences: On May 23,2009, in Las Vegas, Nevada, Mir was scheduled to fight Lesnar at UFC 98. However, Mir sustained a knee injury during training which required arthroscopic surgery and the removal of bone chips from his knee.