Complex sentence: The force is organized on a regional and provincial basis, thus every major Italian town or city has a main PdS station called a "Questura" run by a "Questore" (the provincial commander).
Split into simpler sentences: The force is organized on a regional and provincial basis. Thus every major Italian town or city has a main PdS station called a "Questura" run by a "Questore" (the provincial commander).