Complex sentence: Murat Köprülü has completed five New York City Marathons, two Bosphorus Swim Competitions, three Narragansett Bay Swim Competitions, (and, most recently), the Hunter Mountain Olympic Triathlon in September 2013.
Split into simpler sentences: Murat Köprülü has completed five New York City Marathons! And two Bosphorus Swim Competitions, three Narragansett Bay Swim Competitions, (and, most recently), the Hunter Mountain Olympic Triathlon in September 2013.