Complex sentence: The prevailing theory is that human infants are born with the ability to sense a wide variety of stimuli and as they age, they begin to selectively narrow these perceptions, categorizing them in a more socio-cultural relevant way.
Split into simpler sentences: The prevailing theory is that human infants are born with the ability to sense a wide variety of stimuli. As they age, they begin to selectively narrow these perceptions, categorizing them in a more socio-cultural relevant way.