Complex sentence: The Escape of the Young Pretender (commemorated in "The Skye Boat Song"), he evaded capture and left the country aboard the French frigate "L'Heureux", arriving back in France in September.
Split into simpler sentences: The Escape of the Young Pretender (commemorated in "The Skye Boat Song"). In this way he evaded capture and left the country aboard the French frigate "L'Heureux", arriving back in France in September.