Complex sentence: Fred Davis III is a U.S. Republican Party media consultant and advertising guru who is best known for creating the "Celebrity" ad to presidential candidate John McCain and the "Demon Sheep" ad to the California Senate candidate Carly Fiorina.
Split into simpler sentences: Fred Davis III is a U.S. Republican Party media consultant and advertising guru who is best known for creating political campaign ads for candidates. He created the "Celebrity" ad to presidential candidate John McCain and the "Demon Sheep" ad to the California Senate candidate Carly Fiorina.