Complex sentence: One is the ducal hat kept in the Landesmuseum Joanneum in Graz, Styria, and the other was made for Joseph II in 1764 for his coronation as Holy Roman Emperor in Frankfurt; of which only the metal frame remains.
Split into simpler sentences: One is the ducal hat kept in the Landesmuseum Joanneum in Graz, Styria. The other was made for Joseph II in 1764 for his coronation as Holy Roman Emperor in Frankfurt of which only the metal frame remains.