Complex sentence: The result of these experiments resulted in the February 1909 flight of the Bell-designed "Silver Dart" from the frozen waters of Baddeck Bay: the first airplane flight in Canada and the British Empire.
Split into simpler sentences: The result of those experiments was the February 1909 flight of the "Silver Dart" designed under Bell's tutelage, from the frozen waters of Baddeck Bay. It was the first airplane flight in both Canada and the British Empire.