Complex sentence: His first bout at 140 lbs against Jason Daviswhich took place on the On the undercard of Amir Khan vs. Marcos Maidana on December 11 at the Mandalay Bay Resort & Casino in Las Vegas ended by TKO in just the second round in the favour of Guzman.
Split into simpler sentences: His first bout at 140 lbs against Jason Davis took place on the undercard of Amir Khan vs. Marcos Maidana on December 11 at the Mandalay Bay Resort & Casino in Las Vegas. The bout was ended by TKO in just the second round in the favour of Guzman.