Complex sentence: Don was also for many years the key spokesperson for Trans World Airlines, appearing as himself in many television, radio and print advertisements as part of the Ogilvy & Mather-produced advertising campaign: You're Gonna Like Us (sm).
Split into simpler sentences: Don was also for many years the key spokesperson for Trans World Airlines appearing as himself in many television, print and radio advertisements for the airline. He was the voice and expression of the Ogilvy and Mather advertising campaign: You're Gonna Like Us (sm).