Complex sentence: The school had three divisions: college preparatory, music conservatory, and the first junior college in the southern U.S. to receive full accreditation by the Southern Association of Colleges and Secondary Schools (1935).
Split into simpler sentences: The school had three divisions: college preparatory, music conservatory, and junior college. The latter was the first in the southern U.S. to receive full accreditation by the Southern Association of Colleges and Secondary Schools (1935).