Complex sentence: As one of the senior offices in the Roman Catholic Church, the Secretary is required to be a cardinal, if a non-cardinal is appointed to the office, he servs as Pro-Secretary of State until he can be made a cardinal in the next consistory.
Split into simpler sentences: As one of the senior offices in the Roman Catholic Church, the Secretary is required to be a cardinal. If a non-cardinal is appointed to the office, he servs as Pro-Secretary of State until he can be made a cardinal in the next consistory.