Complex sentence: The Most Interesting Man in the World is an advertising campaign for the Dos Equis brand of beer, produced by the marketing firm Euro RSCG for Cuauhtémoc Moctezuma Brewery.
Split into simpler sentences: The Most Interesting Man in the World is an advertising campaign for the Dos Equis brand of beer. They were produced by the marketing firm Euro RSCG for Cuauhtémoc Moctezuma Brewery.