Complex sentence: Observing his talent, his superiors allowed Tanemura to teach ninpo and jujutsu to policemen at a special martial arts club, and later, he officially became a professor at the police academy.
Split into simpler sentences: Observing his talent, his superiors allowed Tanemura to teach ninpo and jujutsu to policemen at a special martial arts club. Later, he officially became a professor at the police academy.