Complex sentence: He broke the world record in the same event on August 16,1949, clocking 18:35.7, but that time was bettered the same day by compatriot Hironoshin Furuhashi at the American Swimming Championships in Los Angeles, California.
Split into simpler sentences: He broke the world record in the same event on August 16,1949, clocking 18:35.7. However, that time was bettered the same day by compatriot Hironoshin Furuhashi at the American Swimming Championships in Los Angeles, California.