Complex sentence: This period is defined as the beginning of the scientific revolution, leading on into The Age of Enlightenment, sometimes referred to as The Age of Reason--the two fields finally diverged "completely" in the West around the later part of the 18th century.
Split into simpler sentences: This period is defined as the beginning of the scientific revolution, leading on into The Age of Enlightenment, sometimes referred to as The Age of Reason. The two fields finally diverged "completely" in the West around the later part of the 18th century.