Complex sentence: One of the most valuable motorcycles in the world the "Golden Dream Brough" is a Brough Superior is the only example of George Brough's show model for the 1938 Olympia show.
Split into simpler sentences: One of the most valuable motorcycles in the world the "Golden Dream Brough". This Brough Superior is the only example of George Brough's show model for the 1938 Olympia show.