Complex sentence: He equalled the men's world records for the 100 m and 200 m with hand-timed runs of 9.9 seconds and 19.8 seconds, respectively, and was also a member of a team that set a world record in the 4x100 m relay.
Split into simpler sentences: He equalled the men's world records for the 100 m and 200 m with hand-timed runs of 9.9 seconds and 19.8 seconds, respectively. He was also a member of a team that set a world record in the 4x100 m relay.