Complex sentence: Sir Quackly McDuck appears in "The Old Castle's Secret" (1948) by Carl Barks, and "The Last of the Clan McDuck" (1994) by Don Rosa.
Split into simpler sentences: Sir Quackly McDuck first appears in "The Old Castle's Secret" (1948) by Carl Barks. He also appears in "The Last of the Clan McDuck" (1994) by Don Rosa.