Complex sentence: He served in the United States Army from 1943 to 1946 and then worked as a journalist from 1954 to 1979, owning a chain of community weekly newspapers in the Chicago area.
Split into simpler sentences: He served in the United States Army from 1943 to 1946. He worked as a journalist from 1954 to 1979, owning a chain of community weekly newspapers in the Chicago area.