Complex sentence: Shortly after their debut, the ads came under fire from several fronts; fans complained that the legendary musician was debasing himself by doing the commercials, that he was selling out by allowing his image to be used to peddle fast food.
Split into simpler sentences: Shortly after their debut, the ads came under fire from several fronts. Fans complained that the legendary musician was debasing himself by doing the commercials, that he was selling out by allowing his image to be used to peddle fast food.