Complex sentence: Aviator Richard Mays (James Fox), a young Army officer, and (at least in his own eyes) Patricia's fiancé conceives the idea of an air race from London to Paris to advance the cause of aviation (and his career).
Split into simpler sentences: Aviator Richard Mays (James Fox), a young Army officer, and (at least in his own eyes) Patricia's fiancé. Mays conceives the idea of an air race from London to Paris to advance the cause of aviation (and his career).