Well I am still reading the books as we speak. But I do know a lot about stuff from the book. What I do know was originally at the end of the two towers in the book, he fights gandalf again, and gandalf breaks Saruman's staff in two, making him powerless?
Anyways in ROTK the book, Saruman remains a prisoner in Isengard, and the Tower of Orthanc by the ents. And after the war with Sauron is over the ents believe he is no longer a threat and let him go. He then goes to the Shire with his assistant (wormtongue), and they basically take over, etc. This is where the scouring of the shire is. Eventually the Hobbits, and Frodo, Sam, etc. Rebel and fight him, Saruman is killed by wormtongue, and his spirit goes off somewhere else.
People who have read the book can fill in that rough outline with a little more detail.
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