Complex sentence: He is a very good fighter with a rapier and after he dies killing many Sardaukar the Sardaukar sold his body to the Tleilaxu who grew the clones of Duncan from the original cells.
Split into simpler sentences: He is a very good fighter with a rapier and after he dies killing many Sardaukar. The Sardaukar sold his body to the Tleilaxu who grew the clones of Duncan from the original cells.