Complex sentence: He tried to smuggle the Hobbits away from the Uruk-hai and into Fangorn Forest: a Rohirrim rider shot him in the hand before killing him with a spear.
Split into simpler sentences: He tried to smuggle the Hobbits away from the Uruk-hai and into Fangorn Forest. A Rohirrim rider shot him in the hand before killing him with a spear.