Complex sentence: The ban however was altered following Méndez Arceo's trip to Rome where he pleaded the case of the CIDOC, priests and nuns may study at the CIDOC as long as their superiors monitor their progress.
Split into simpler sentences: The ban however was altered following Méndez Arceo's trip to Rome where he pleaded the case for the CIDOC. It was decided that priests and nuns may study at the CIDOC as long as their superiors monitored their progress.