Complex sentence: Frank Levingston (November 13,1905--May 3,2016), was an American supercentenarian, was the oldest living man in the United States and the oldest verified surviving American World War II veteran.
Split into simpler sentences: Frank Levingston (November 13,1905--May 3,2016) was an American supercentenarian. He was the oldest living man in the United States and the oldest verified surviving American World War II veteran.