Complex sentence: Uruguay has qualified one rider in the jumping competition after obtaining a top ten finish at the 2015 Pan American Games, signifying the nation's Olympic equestrian comeback for the first time in 56 years.
Split into simpler sentences: Uruguay has qualified one rider in the jumping competition after obtaining a top ten finish at the 2015 Pan American Games. Uruguay will be represented in the Olympic jumping competition for the first time in 56 years.