Complex sentence: The new structure was a grey granite building with a copperplate dome in the form of the Japanese crown; its floorplan allegedly was set up in the form of the first character in the Japanese name for Japan, "Nippon" (日本).
Split into simpler sentences: The new structure was a grey granite building with a copperplate dome. Its floorplan allegedly was set up in the form of the first character in the Japanese name for Japan, "Nippon" (日本).