Complex sentence: At a later date, the ship was again returned to the Maritime Administration, which turned her over in 1962 to the Maine Maritime Academy, which operated her as TS "State of Maine" until returning her to the Maritime Administration in 1973.
Split into simpler sentences: At a later date, the ship was again returned to the Maritime Administration, which turned her over in 1962 to the Maine Maritime Academy. The latter operated her as TS "State of Maine" until returning her to the Maritime Administration in 1973.