Complex sentence: He competed at the 2015 World Aquatics Championships, and qualified for the 2016 Summer Olympics, where he is the first male Jamaican diver at the Olympics, as well as the first male diver competing there from any island in the Caribbean.
Split into simpler sentences: He competed at the 2015 World Aquatics Championships, and qualified for the 2016 Summer Olympics. In doing so, he became the first male Jamaican diver at the Olympics, as well as the first male Olympic diver competing from any island in the Caribbean.