Complex sentence: Fortunately, his friend Lord Edmund St. John-Smythe has developed an electrical fan, and its vibrations bring Dr. Granville to the idea to modify the gadget to a vibrator which then successfully enters the stage as a medical device for the treatment of the condition.
Split into simpler sentences: Fortunately, his friend Lord Edmund St. John-Smythe has developed an electrical fan, and its vibrations give Dr. Granville the idea to modify the gadget. As such the vibrator enters the stage as a medical device for the treatment of the condition.