Complex sentence: In July 1972, Greigg moved from his party position to a similar role in the 1972 presidential campaign of George McGovern, and served as director of the Lawrence F. O'Brien Center at Dag Hammarskjold College in 1972.
Split into simpler sentences: In July 1972, Greigg moved from his party position to a similar role in the 1972 presidential campaign of George McGovern. He also served as director of the Lawrence F. O'Brien Center at Dag Hammarskjold College in 1972.