Complex sentence: Long track speed skater Shani Davis became the first man to win back-to-back gold in the 1000 meter event, and also earned a silver medal at 1500 meters, duplicating his feat from four years earlier.
Split into simpler sentences: Long track speed skater Shani Davis became the first man to win back-to-back gold in the 1000 meter event. Davis also earned a silver medal at 1500 meters, duplicating his Olympic results from four years earlier.