Complex sentence: In recent times, mural crowns have been used in opposition to royal crowns; it's typical of Italian medieval and modern Communes and is a symbol of Italy; also the coat of arms of the Second Spanish Republic had a mural crown.
Split into simpler sentences: In recent times, mural crowns have been used in opposition to royal crowns; they are typical of Italian medieval and modern Communes. The coat of arms of the Second Spanish Republic had a mural crown.