The process of arranging or setting something in order in a new way is reorganization. The reorganization of your bookshelves will make it easier to find a book that you're searching for.
Reorganization can happen on a small scale, like the reorganization of your kitchen spices so they're in alphabetical order. There are also larger examples, like a country's reorganization of its entire government or a state's reorganization of its school system. This noun comes from the verb reorganize, which adds the "again" prefix re- to organize, from the Greek organon, "tool or implement."