Complex sentence: Couder's Experiment involves a oil-filled tray placed on a vibrating surface whose intensity is such that it is just below the intensity required for the formation of Faraday's Waves on the surface.
Split into simpler sentences: Couder's Experiment involves a oil-filled tray placed on a vibrating surface. The intensity is such that it is just below the intensity required for the formation of Faraday's Waves on the surface.