Complex sentence: While WIPCO always restored the power, it was not because of a payment arrangement, but because of the fact that the utility would have thus been responsible for a 1,600-foot unlighted airplane hazard.
Split into simpler sentences: While WIPCO always restored the power, it was not because of a payment arrangement. Rather, it was due to the fact that the utility would have thus been responsible for a 1,600-foot unlighted airplane hazard.