Complex sentence: Sohn Kee-chung (August 29,1912--November 15,2002) became the first medal-winning Korean Olympian, when he won the gold medal in the marathon at the 1936 Berlin Olympics as a member of the Japanese delegation.
Split into simpler sentences: Sohn Kee-chung (August 29,1912--November 15,2002) was a Korean athlete and long-distance runner. He became the first Korean to medal at the Olympic Games, winning gold in the marathon at the 1936 Berlin Olympics as a member of the Japanese delegation.