Complex sentence: On November 6,1977, the Kelly Barnes Dam, built up and used by the college for electrical power since the Toccoa Falls Institute days, collapsed and the lake it impounded drained through the lower part of the campus.
Split into simpler sentences: On November 6,1977, the Kelly Barnes Dam, which had been built up and used by the college for electrical power since the Toccoa Falls Institute days, collapsed. The lake it impounded drained through the lower part of the campus.