Complex sentence: Kim Conley is an American athlete, who competes in middle distance track events and long distance track events and finished in third place at the 2012 United States Olympic Trials (track and field) to qualify for the 2012 Olympics.
Split into simpler sentences: Kim Conley is an American athlete, who competes in middle and long distance track events. She finished in third place at the 2012 United States Olympic Trials (track and field) to qualify for the 2012 Olympics.