Complex sentence: The Edo explain that their police, called "Mediators", enforce the law by setting up random "forbidden zones" and because of the fear of execution, no one willingly breaks the law.
Split into simpler sentences: The Edo explain that their police, called "Mediators", enforce the law by setting up random "forbidden zones". No one ever knows when or where a forbidden zone is placed, and because of the fear of execution, no one willingly breaks the law.