Complex sentence: Classes were offered at the former Griffiss Air Force Base from 1954 to 1958 and again from 1969 to 1974, a branch campus was established in Rome at the current location on Floyd Avenue.
Split into simpler sentences: Classes were offered at the former Griffiss Air Force Base from 1954 to 1958 and again from 1969 to 1974. In 1974, a branch campus was established in Rome at the current location on Floyd Avenue.