Complex sentence: Graham is the nephew of Mark Reynolds, a three-time Olympic medalist and four-time Olympian in sailing who won gold in the mixed two-person keelboat at the Barcelona 1992 Olympic Games and Sydney 2000 Olympic Games.
Split into simpler sentences: Graham is the nephew of Mark Reynolds, a three-time Olympic medalist and four-time Olympian in sailing. He won gold in the mixed two-person keelboat at the Barcelona 1992 Olympic Games and Sydney 2000 Olympic Games.