Given the situation, Jigoro KANO theorized and rationalized jujutsu (a kind of Japanese martial art style including unarmed and armed techniques) in his own way, developed judo from it, did lots of "randori" (free-style) practice, and thus flourished.
このような中、嘉納治五郎は柔術を独自に理論化・合理化した柔道を開き乱取り稽古を盛んに行い大いに栄えた。