Complex sentence: Jack McCarthy (born May 23,1939 in Massachusetts) is an American writer and slam poet living in the state of Washington, who began writing in the 1960s, however, did not begin performing his works for audiences until the 1990s.
Split into simpler sentences: Jack McCarthy (born May 23,1939) is an American writer and slam poet. He began writing in the 1960s, but did not begin performing his works for audiences until the 1990s.