Complex sentence: "Treehouse of Horror VIII" (originally known as "The Simpsons Halloween Special VIII") is the fourth episode of "The Simpsons"' ninth season and first aired on the Fox network on October 26,1997.
Split into simpler sentences: Treehouse of Horror VIII is the fourth episode of "The Simpsons"' ninth season. It first aired on the Fox network in the United States on October 26,1997.