Complex sentence: It was a pair of bicycle mechanics in Dayton, Ohio, Wilbur and Orville Wright, who achieved the first powered flight in an aircraft, whose design owed much to knowledge gained from bicycles.
Split into simpler sentences: It was a pair of bicycle mechanics in Dayton, Ohio, Wilbur and Orville Wright, who achieved the first powered flight in an aircraft. Their design owed much to knowledge gained from bicycles.