Complex sentence: Barnwell County joined the commission in 1967 and Colleton County followed in 1984 thereby the campus was named after the Salkehatchie River because it runs through all five counties of the commission.
Split into simpler sentences: Barnwell County joined the commission in 1967 and Colleton County followed in 1984. The campus was therefore named after the Salkehatchie River because it runs through all five counties of the commission.