Complex sentence: The, also known as or, is the most common name for the sword that the ninja of feudal Japan are portrayed to have carried in movies, on television, and in numerous books written by modern ninjutsu practitioners including Masaaki Hatsumi and Stephen K. Hayes.
Split into simpler sentences: The, also known as or, is the most common name for the sword that the ninja of feudal Japan carried. It is potrayed by modern ninjutsu practitioners including Masaaki Hatsumi and Stephen K. Hayes.