Complex sentence: "Proud as a Peacock" was the advertising campaign used by the NBC television and radio networks from 1979 to 1981, used to help introduce the "Proud N", a logo that would be used until 1986.
Split into simpler sentences: Proud as a Peacock was the advertising campaign used by the NBC television and radio networks from 1979 to 1981. The campaign was used to promote NBC's programming and to introduce the "Proud N", a logo that would be used until 1986.