Complex sentence: Certain rules apply to the real estate companies' ability to display each detail about a property, these "display rules" are set by the Multiple Listing Service organization, which generally forms its policy around the recommendations of the National Association of Realtors.
Split into simpler sentences: Certain rules apply to the real estate companies' ability to display each detail about a property. These "display rules" are set by the Multiple Listing Service organization, which generally forms its policy around the recommendations of the National Association of Realtors.