Complex sentence: At the center of its media campaign was the popular "Miss Rheingold" pagaent; beer drinkers would vote annually on the young lady to would be featured as Miss Rheingold in advertisements.
Split into simpler sentences: At the center of its media campaign was the "Miss Rheingold" pagaent. Beer drinkers would vote each year on the young lady who would be featured as Miss Rheingold in advertisements.