Complex sentence: For a long period of time the South Asian nations of India and Pakistan dominated the Olympics, with India winning gold in every olympics from 1928-1956, but recently various teams from around the world have seen success at the Olympics.
Split into simpler sentences: For a long period of time the South Asian nations of India and Pakistan dominated the Olympics, with India winning the gold medal in every Olympics from 1928 to 1956. Since 1956 various teams from around the world have seen gold medal success at the Olympics.