Complex sentence: In 1985, he went to the American Wrestling Association as "Boris Zukhov" from the Soviet Union, taking on Chris Markoff as his manager and challenging AWA World Champion Rick Martel and AWA Americas Champion Sgt. Slaughter.
Split into simpler sentences: In 1985, Harrell debuted in the American Wrestling Association as "Boris Zukhov", billed as being from the Soviet Union. Zhukov adopted Chris Markoff as his manager and challenged AWA World Heavyweight Champion Rick Martel and AWA America's Champion Sgt. Slaughter.