Complex sentence: It is one of the best-known American tobacco advertising campaigns--in 1999, "Advertising Age" ranked the jingle eighth-best out of all the television jingles that aired in the United States in the 20th century.
Split into simpler sentences: It is one of the best-known American tobacco advertising campaigns. In 1999, "Advertising Age" ranked the jingle eighth-best out of all the television jingles that aired in the United States in the 20th century.