Complex sentence: Toploski coached the British rowing squads competing at the 1980 and 1984 Olympics and was a commentator for the BBC at the 2000 Sydney and 2004 Athens Olympics, again being part of the commentary team in 2008 for the Beijing Olympics.
Split into simpler sentences: Toploski coached the British rowing squads competing at the 1980 and 1984 Olympics. He also acted as a commentator for the BBC at the 2000 Sydney and 2004 Athens and 2008 Beijing Olympics.