“Randstedelingen” is a Dutch word with 15 letters, not 9. It refers to the people living in the Randstad, the metropolitan area in the Netherlands consisting of Amsterdam, Rotterdam, The Hague, Utrecht, and their surrounding cities.
Perhaps you were thinking of a different word or phrase with 9 letters that uses some of the same letters as “Randstedelingen”? If you could provide more context or information about what you’re looking for, I might be able to help you better.