Original sentence: It was renewed in the Gnosticism of the Cathars in the 11th through 13th centuries, and in the Age of Enlightenment of the 18th century, and Restorationism during the 19th century until the present.Nontrinitarianism refers to Chrisitan beliefs systems that are in conflict with the Trinity or the doctrine that God is three distinct persons in one being.Nontrinitarianism was not prevalent for hundreds of years
Edited sentence: It surfaced again in the Gnosticism of the Cathars and in the Enlightenment and Restorationism.Nontrinitarianism is any of various Christian beliefs that reject the doctrine  that God is three distinct persons in one being, (the  Trinity).Nontrinitarianism was very rare for hundreds of years