Original sentence: He had earned his nidan (second degree black belt out of then five) from judo's founder, Kano Jigoro, and he was one of the first foreigners who learned Judo in Japan and he used some of Kano's philosophy in formulating the early development of the new Soviet art
Edited sentence: He was one of the first foreigners to learn Judo in Japan and had earned his nidan (second degree black belt out of then five) from judo's founder, Kano Jigoro.Oschepkov used some of Kano's philosophy to formulate the early development of the new Soviet art