Complex sentence: After three years of college he joined the East Wind Community in the Ozark Mountains of southern Missouri for a year, and then the Twin Oaks Community in the Blue Ridge Mountains of Virginia for about four years.
Split into simpler sentences: After three years of college he joined the East Wind Community in the Ozark Mountains of southern Missouri for a year. He then became part of the Twin Oaks Community in the Blue Ridge Mountains of Virginia for about four years.