Complex sentence: Chandra Danette Cheeseborough (born January 10,1959 in Jacksonville, Florida) broke onto the international track scene at age 16 by winning two gold medals at the 1975 Pan American Games, taking the 200 m in an American record time of 22.77 seconds.
Split into simpler sentences: Chandra Danette Cheeseborough (born January 10,1959 in Jacksonville, Florida) is an American track and field athlete. Cheeseborough broke onto the international track scene at age 16 by winning two gold medals at the 1975 Pan American Games, taking the 200 m in an American record time of 22.77 seconds.