Complex sentence: A tin foil hat is a hat made from one or more sheets of aluminium foil, or a piece of conventional headgear lined with foil, worn in the belief that it shields the brain from electromagnetic fields, mind control, and mind reading.
Split into simpler sentences: A tin foil hat is a hat made from one or more sheets of aluminium foil, or a piece of conventional headgear lined with foil. Either is worn in the belief that it shields the brain from electromagnetic fields, mind control, and mind reading.