Complex sentence: Wearing polyester or nylon socks may increase the amount of perspiration because they do not let the feet breathe as well as cotton, and this may intensify foot odor, although polyester and nylon help reduce blisters by keeping the perspiration away from the foot.
Split into simpler sentences: Wearing polyester or nylon socks may increase the amount of perspiration because they do not let the feet breathe as well as cotton. This may intensify foot odor, although polyester and nylon can help reduce blisters by keeping the perspiration away from the foot.