Complex sentence: At the end of that long conflict, Death and Schirach were stripped of their powers, and Saruin was imprisoned through the might of the ten Fatestones and the hero Mirsa's ultimate sacrifice.
Split into simpler sentences: At the end of that long conflict, Death and Schirach were stripped of their powers. And at last Saruin was imprisoned through the might of the ten Fatestones and the hero Mirsa's ultimate sacrifice.