Complex sentence: "Killer Within" is the fourth episode of the third season of the post-apocalyptic horror television series "The Walking Dead", scheduled to air on AMC in the United States on November 4,2012.
Split into simpler sentences: Killer Within is the fourth episode of the third season of the post-apocalyptic horror television series "The Walking Dead". It originally aired on AMC in the United States on November 4,2012.