Complex sentence: This list presents eight entries of National Treasures from four castles built during the late Momoyama to early Edo period; however, the number of structures is actually more because in some cases multiple structures have been combined to form a single entry.
Split into simpler sentences: This list presents eight entries of structures from four castles built during the late Momoyama to early Edo period. In fact the number of structures presented is more than eight, because in some cases groups of related structures are combined to form a single entry.