Complex sentence: Despite renown for his nimble footwork and mastery of kendo, Kojirō is most famous for his death at the hands of Musashi Miyamoto, althoguh some historians question whether Kojirō existed at all, he exists in government records, but there is some discrepancy about his age.
Split into simpler sentences: Despite renown for his nimble footwork and mastery of kendo, Kojirō is most famous for his death at the hands of Musashi Miyamoto, although some historians question whether Kojirō existed at all. He exists in government records, but there is some discrepancy about his age.