Complex sentence: In contrast to the mainstream interpretation, there is a fringe hypothesis according to which the reliefs depict Ancient Egyptian electrical technology, based on comparison to similar modern devices (such as Geissler tubes, Crookes tubes, and arc lamps).
Split into simpler sentences: In contrast to the mainstream interpretation, there is a fringe hypothesis according to which the reliefs depict Ancient Egyptian electrical technology. Controversy exists over the images as interpreted as electric lamps based on comparison to similar modern devices (such as Geissler tubes, Crookes tubes, and arc lamps).