Complex sentence: He returned to New York to teach aikido at the Tremont School, where he realized formal aikido was not suitable for the residents of the Bronx, this lead him to create a new jujutsu system that was adapted for the streets and called it Miyama Ryu Jujutsu.
Split into simpler sentences: He returned to New York to teach aikido at the Tremont School, where he realized formal aikido was not suitable for the residents of the Bronx. This led him to create a new jujutsu system that was adapted for the streets and called it Miyama Ryu Jujutsu.