Complex sentence: Wyndham Halswelle (30 May 1882--31 March 1915) was a British athlete, winner of the controversial 400m race at the 1908 Summer Olympics, becoming the only athlete to win an Olympic title by a walkover.
Split into simpler sentences: Wyndham Halswelle (30 May 1882--31 March 1915) was a British athlete. He won the controversial 400 m race at the 1908 Summer Olympics, becoming the only athlete to win an Olympic title by a walkover.