Complex sentence: Today, a large number of Roman Catholic churches dedicated to the Blessed Virgin exist on all continents (except Antarctica), and in a sense, the progress of Roman Catholic Marian church architecture tells the unfolding story of the development of Roman Catholic Mariology.
Split into simpler sentences: Today, a large number of Roman Catholic churches dedicated to the Blessed Virgin exist on all continents (except Antarctica). This history of Roman Catholic Marian church architecture tells the unfolding story of the development of Roman Catholic Mariology.