Complex sentence: It's unknown if this will have any effect in the continuity of "The Simpsons", though it seems unlikely given the people of Springfield' crushed'Shelbyville in "Who Shot Mr. Burns?", when they pulled down Mr Burns' sunblocker.
Split into simpler sentences: It's unknown if this will have any effect in the continuity of "The Simpsons". Though it seems somewhat unlikely given the people of Springfield' crushed'Shelbyville in "Who Shot Mr. Burns?", when they pulled down Mr Burns' sunblocker.