Complex sentence: WMEX operated with the maximum power allowed by the Federal Communications Commission, 50,000 watts, but it used a highly directional antenna to protect Class A, 50,000-watt, WLAC in Nashville (which also protected WMEX).
Split into simpler sentences: WMEX operated with the maximum power allowed by the Federal Communications Commission, 50,000 watts. But it used a highly directional antenna to protect Class A, 50,000-watt, WLAC in Nashville (which also protected WMEX).