Complex sentence: Ittō-ryū ("one-sword school") is the ancestor school of several Japanese koryu kenjutsu styles, including Ono-ha, Mizoguchi-ha, Nakanishi-ha, Kogen, Hokushin, and Itto Shoden.
Split into simpler sentences: Ittō-ryū ("one sword school") is the ancestor school of several Japanese koryu kenjutsu styles. These include Ono-ha, Mizoguchi-ha, Nakanishi-ha, Kogen, Hokushin, and Itto Shoden.