Complex sentence: Subspecies include cold-drakes and fire-drakes, of which Smaug the Golden is the most well known, who was burgled by Bilbo and slain by Bard of Lake-Town and Dale.
Split into simpler sentences: Subspecies include cold-drakes and fire-drakes. Of these Smaug the Golden is the most well known, who was burgled by Bilbo and slain by Bard of Lake-Town and Dale.