Complex sentence: One of the builders of the the Kosciuszko Bridge was a man named John Kelly, of Greenpoint, who was a former Navy deep sea diver who became famous for helping to work on the Kosciuszko Bridge.
Split into simpler sentences: One of the builders of the The Kosciuszko Bridge was a man named John Kelly. Kelly of Green Point was a former Navy deep sea diver who became famous for helping to work on the Kosciuszko Bridge.