Complex sentence: The element generated 2.5 kW at 330 V, and was powered by a cable that ran down the steel tube, and was connected to power at the Sphinx Observatory by a cable laid across the snow.
Split into simpler sentences: The element generated 2.5 kW at 330 V, and was powered by a cable that ran down the steel tube. It was connected to power at the Sphinx Observatory by a cable laid across the snow.