Complex sentence: Kumogakure-ryū Ninpō Happo Hiken ("The Hidden in the Clouds School") is one of the nine schools of martial arts within the Bujinkan sphere of training.
Split into simpler sentences: Kumogakure-ryū Ninpō Happo Hiken translated into English as "The Hiding in the Clouds School". It is one of the nine schools of martial arts within the Bujinkan sphere of training.