Complex sentence: DuVal served on the Democratic National Committee twice, from 1989 to 1993 and 2009 to 2011, was Treasurer of the Democratic Governors Association from 2008 to 2010, and was one of the original founders of the Democratic Leadership Council in 1985.
Split into simpler sentences: DuVal served on the Democratic National Committee twice, from 1989 to 1993 and 2009 to 2011. He was Treasurer of the Democratic Governors Association from 2008 to 2010, and was one of the original founders of the Democratic Leadership Council in 1985.