Complex sentence: The squat toilet (also called "squatter" or "squatty-potty") consists of a hole in the ground; however, it does flush like a modern toilet, not to be compared to a contemporary portable toilet with no plumbing.
Split into simpler sentences: The squat toilet (also called "squatter" or "squatty-potty") consists of a hole in the ground. However, common modern versions flush like a modern seated toilet, and are not to be compared to a contemporary portable toilet with no plumbing.