Complex sentence: Jack Nash (April 10,1929--July 30,2008) was an American businessman and hedge fund manager who served as president of Oppenheimer & Company and founded the "New York Sun" newspaper.
Split into simpler sentences: Jack Nash (April 10,1929--July 30,2008) was an American businessman and investor. He served as president of Oppenheimer & Company and founded the "New York Sun" newspaper.