Complex sentence: Jon Soltz served as a United States Army Captain in the Iraq War and served as the chairman and co-founder of VoteVets.org, before taking a leave of absence for a year beginning in 2011, while deployed as part of Operation New Dawn (Iraq).
Split into simpler sentences: Jon Soltz served as a United States Army Captain in the Iraq War and is Chairman and co-founder of VoteVets.org. In 2011, he took a one year leave of absence from VoteVets, while deployed as part of Operation New Dawn (Iraq).