Complex sentence: Almost all of advisers, including Kim Don-jung and Han Roe, were killed and King Uijong was overthrown; then he set up a puppet king, King Myeongjong, beginning the 100-year military rule of Korea.
Split into simpler sentences: Almost all of advisers, including Kim Don-jung and Han Roe, were killed and King Uijong was overthrown. Jeong then set up a puppet king, King Myeongjong, beginning the 100-year military rule of Korea.