Complex sentence: Koshirou was included in the live-action movie although several changes were made to his character; the biggest being that he was part of the Kouga ninjas, had a beard and he does not use either sickles or his kamaitachi technique.
Split into simpler sentences: Koshirou was included in the live-action movie although several changes were made to his character. The biggest was that Koshirou was part of the Kouga ninjas, had a beard and did not use either sickles or his kamaitachi technique.