Complex sentence: He is a second-generation Greek-American, born in New York City.When he was a kid he worked as a sailor on a tanker for a summer and he traveled around the world cause he had a great desire to know the world.
Split into simpler sentences: He is a second-generation Greek-American, born in New York City. As a young man he worked as a sailor on a tanker for a summer because he had a great desire to travel the world.