Complex sentence: The samurai, led by Katsumoto (Ken Watanabe), are rebelling against Western influence, so Algren must train peasant conscripts to suppress it but once engaged the poorly-trained army are routed and Gant is killed.
Split into simpler sentences: The samurai, led by Katsumoto (Ken Watanabe), are rebelling against Western influence, so Algren must train peasant conscripts to suppress them. Once engaged however, the poorly-trained army are routed and Gant is killed.