Complex sentence: It functions by using two opposing and identical disc-shaped rotors that are offset by 90 degrees around the central shaft, these rotors have a sinusoidal side proflie with two "bumps" and two "valleys".
Split into simpler sentences: It functions by using two opposing and identical disc-shaped rotors that are offset by 90 degrees around the central shaft. These rotors have a sinusoidal side proflie with two "bumps" and two "valleys".