Complex sentence: However, WZTV was the only one that was profitable, so by 1985, it became clear that Nashville could not support three independent stations, a large number for that time in only a medium-sized market.
Split into simpler sentences: However, WZTV was the only one that was profitable. By 1985, it became clear that Nashville could not support three independent stations, a large number for that time in only a medium-sized market.