Complex sentence: This group also helped establish the College of Charles Towne in 1770, the oldest college in South Carolina and, until its transition to state ownership in 1970, the oldest municipally supported college in the United States.
Split into simpler sentences: This group also helped establish the College of Charles Towne in 1770, the oldest college in South Carolina. Until its transition to state ownership in 1970, this was the oldest municipally supported college in the United States.