Complex sentence: Nakamura Sensei developed Battodo while teaching kenjutsu in northern China where he was inspired with the idea that eiji happo (the eight rules of calligraphy) could be applied to swordsmanship.
Split into simpler sentences: Nakamura Sensei developed Battodo while teaching kenjutsu in northern China. He was inspired by the idea that eiji happo (the eight rules of calligraphy) could be applied to swordsmanship.