Complex sentence: In the 1980s John McCosker noted that divers who dove solo and were attacked by great whites were generally at least partially consumed, while divers who followed the buddy system were generally rescued by their buddy.
Split into simpler sentences: In the 1980s John McCosker noted that divers who dove solo and were attacked by great whites and were generally at least partially consumed. While divers who followed the buddy system, were generally rescued by their buddy.