Complex sentence: He managed to tricked Shi Shiming to think that there will be an ambrush if he come any closer and manages to stall him for forty days until the comamnder of Tang, Li Guangbi came for help with ninety thousand man.
Split into simpler sentences: He managed to trick Shi Shiming into thinking that there would be an ambrush if he came any closer, and managed to stall him for forty days. The comamnder of Tang, Li Guangbi, then came for help with ninety thousand man.