Site maps are used to layout what webpages are going to fit and give the creator a visual. It help's organize where each page is placed and what category your page may be used for. Some pages ways to make the job easier is color coding it to find what you need faster or numbering them. As you can see there some pages that are single, and some that are stacked up together. The ones that are stacked are ones that share the same layout also fit the same category. You can only do this if its the last set of pages aswell.
