Complex sentence: De Varona was the youngest swimmer to compete at the 1960 Summer Olympics, while at the following Olympics, she won gold medals in the 400 meter individual medley and as a member of the 400 meter freestyle relay.
Split into simpler sentences: De Varona was the youngest swimmer to compete at the 1960 Summer Olympics. In the following Olympics, she won gold medals in the 400-meter individual medley and as a member of the 400-meter freestyle relay.