Complex sentence: During the Megoville Civil War, a clone of Thor was created by Iron Man and Mister Fantastic to fill in the ranks of the pro-prohibition heroes who, in a reference to the Spiderman Clone Sage, was dressed in the same sweater worn by the Scarlet Spider.
Split into simpler sentences: During the Megoville Civil War, Thor was cloned by Iron Man and Mister Fantastic to fill in the ranks of the pro-prohibition heroes. In a reference to the Spiderman Clone Sage, Clone Thor was depicted as wearing the same sweater worn by the Scarlet Spider.