This would fit much better in the Jedi Outcast forum.
I believe he means the Reborn you fight in the wind tunnel on Bespin. Well, I don't really know how much help I can be since I've never really had any trouble fighting him. So the only suggestion I have is to wait for him to come to you, then just start slashing away with your saber. If you can, wait until you see an open spot in his defense, and make a quick slash at that area. That may be a bit technical, but that's how I think and play.
Btw, welcome to LucasForums!
edit: heh, this thread was moved during the time I was writing this post.