Original sentence: He is a proponent of sedevacantism, a position that holds the papacy is currently vacant; thus he is not in communion with the Holy See nor is he recognised as a bishop by the Catholic Church that is follower of Second Vatican Council
Edited sentence: He is a proponent of sedevacantism, a position that holds the papacy is currently vacant; thus he is not in communion with the Holy See nor is he recognised as a bishop by the Roman Catholic Church