Complex sentence: Some of the samurai, more disgruntled than the others, formed pockets of resistance in order to circumvent the mandatory military service, many committed self-mutilation or openly rebelled (Satsuma Rebellion).
Split into simpler sentences: Some of the samurai, more disgruntled than the others, formed pockets of resistance to circumvent the mandatory military service. Many committed self-mutilation or openly rebelled (Satsuma Rebellion).