need help getting a document that has 6 total pages but can only show in thumbnails as 2 pages. its

its a large trifold brochure that prints 3 pages front and back on a 8.5x33. I need to break it down into indvidual 6 pages so they all show up in thumbnails and I can move and edit the pages. Any help would be great. This is my first question ever on an online blog forum