Complex sentence: The story revolves around Yasunori Katō, a mysterious former lieutenant of the Imperial Japanese Army, as well as a sorcerer and an oni; the embodiment of the curse of the indigenous tribes of the Japanese islands who fought against the Yamato Court in ancient times.
Split into simpler sentences: The story revolves around Yasunori Katō, a mysterious former lieutenant of the Imperial Japanese Army. Katō is also a specialist in the occult and an oni; the embodiment of the curse of the indigenous tribes of the Japanese islands who fought against the Yamato Court in ancient times.