Complex sentence: The diving response involves apnoea, reflex bradycardia, and peripheral vasoconstriction; in other words a baby immersed in water will spontaneously hold his or her breath, slow his heartrate, and reduce blood circulation to the extremities such as fingers and toes.
Split into simpler sentences: The diving response involves apnoea, reflex bradycardia, and peripheral vasoconstriction. This means that a baby immersed in water will spontaneously hold his or her breath, slow his heartrate, and reduce blood circulation to the extremities such as fingers and toes.