Complex sentence: A seasoned competitor with a potent finishing kick, he competed at the 2012 Summer Olympics in the 1500 meters--where he finished 4th--and he won a gold medal in the 1500 metres at the Rio De Janeiro 2016 Olympic Games.
Split into simpler sentences: A seasoned competitor with a potent finishing kick, he competed at the 2012 Summer Olympics in the 1500 meters--where he finished 4th. He won the gold medal in the 1500 metres at the Rio De Janeiro 2016 Olympic Games.