Complex sentence: Miyamoto Hanzo was a student of both Inoue Keitaro and Tozawa Tokusaburō (戸沢 徳三郎, 1848--1912), who is believed to have briefly taught jujutsu to aikido founder Ueshiba Morihei.
Split into simpler sentences: Miyamoto Hanzo was a student of both Inoue Keitaro and Tozawa Tokusaburō (戸沢 徳三郎, 1848--1912). Tozawa is believed to have briefly taught jujutsu to aikido founder Ueshiba Morihei.