Complex sentence: A 2013 study of Neanderthal skulls suggests that their eyesight may have been better than that of modern humans, owing to larger eye sockets and larger areas of the brain devoted to vision.
Split into simpler sentences: A 2013 study of Neanderthal skulls suggests that their eyesight may have been better than that of modern humans. This may be attributable to larger eye sockets and larger areas of the brain devoted to vision.