Complex sentence: He won two Grand Slam singles titles (the 1996 French Open and the 1999 Australian Open), four Grand Slam doubles titles, and the men's singles gold medal at the Sydney Olympic Games in 2000.
Split into simpler sentences: He won two Grand Slam singles titles, which the 1996 French Open and the 1999 Australian Open. He also won four Grand Slam doubles titles, and the men's singles gold medal at the Sydney Olympic Games in 2000.