Complex sentence: Minny, as a form of insurance, reveals her "Terrible Awful" story which describes how, in a fit of pique over being fired and having her reputation damaged by Hilly's lies, Minny baked her own excrement into a chocolate pie for Hilly.
Split into simpler sentences: Minny, as a form of insurance, reveals her "Terrible Awful" story. In a fit of pique over being fired and having her reputation damaged by Hilly's lies, Minny baked her own excrement into a chocolate pie for Hilly.