Complex sentence: It should be noted that since neoprene contains air pockets, the material compresses under water pressure, getting thinner at greater depths; a 7 mm neoprene wet suit offers much less exposure protection under one hundred feet of water than at the surface.
Split into simpler sentences: It should be noted that since neoprene contains air spaces, the material compresses under water pressure, getting thinner at greater depths. So a 7 mm neoprene wet suit offers much less exposure protection under one hundred feet of water than at the surface.