Complex sentence: He was the first non-Japanese practitioner of Tenshin Shōden Katori Shintō-ryū, achieving instructor status ("kyoshi menkyo") in that system, and he also held high ranks in Shindo Muso-ryu jodo and kendo.
Split into simpler sentences: He was the first non-Japanese practitioner of Tenshin Shōden Katori Shintō-ryū, achieving instructor status ("kyoshi menkyo") in that system. He also held high ranks in Shindo Muso-ryu jodo and kendo.