Complex sentence: At the 2004 Summer Olympics Hall won again the gold medal in 50 m FreestyleHall became the oldest American Male Olympic swimmer, 29, since 1924 when Duke Kahanamoku competed.
Split into simpler sentences: At the 2004 Summer Olympics Hall again won the gold medal in 50 m Freestyle. At 29, Hall became the oldest American Male Olympic swimmer since 1924 when Duke Kahanamoku competed.