Complex sentence: Such devices can be of either the "pancake" type, where a scrap automobile is flattened by a huge descending hydraulically powered plate, or the baling press, where the automobile is compressed from several directions until it resembles a large cube.
Split into simpler sentences: Such devices can either be of the "pancake" type, where a scrap automobile is flattened by a huge descending hydraulically powered plate. The other type is the baling press, where the automobile is compressed from several directions until it resembles a large cube.