Complex sentence: The Duchess of Windsor, the American spouse of Edward VIII was great admirer of Lillet introducing it to the high society, particularly at Fauchon, and into the upper-class hotels Parisian as at the George V or the Ritz where she stayed regularly.
Split into simpler sentences: The duchess of Windsor, the American spouse of Edward VIII was great amateur of Lillet. She introduces Lillet to the high society, particularly at Fauchon, and into the upper-class hotels Parisian as George V or Ritz where she stayed regularly.