Complex sentence: Marquardt then fought Crafton Wallace--a replacement for Marquardt's original opponent, Thales Leites--on the undercard of' on October 10,2006, winning by rear naked choke in the second round.
Split into simpler sentences: Marquardt then fought Crafton Wallace, a replacement for Marquardt's original opponent, Thales Leites, on the undercard of' on October 10,2006. Marquardt won by rear naked choke in the second round.