Complex sentence: Nick Catone was expected to face Vitor Miranda at the event; however, Catone abruptly announced his retirement on March 25, citing a litany of injuries and a history of chronic back pain.
Split into simpler sentences: Nick Catone was expected to face Vitor Miranda at the event. However, Catone abruptly announced his retirement on March 25, citing a litany of injuries and a history of chronic back pain.