Complex sentence: In 1960, Greene became a book editor for the Dallas Times-Herald; and in 1963, the Times-Herald appointed Greene as editor of the Editorial Page of the Dallas Times-Herald, a role he performed until 1965.
Split into simpler sentences: In 1960, he became a book editor for the Dallas Times-Herald. In 1963, Greene was appointed as editor of the editorial page of the Dallas Times-Herald, a role he performed until 1965.