Complex sentence: On their arrival in New York, Emma's secretary, Gaye, tells her that she heard Emma's sons discussing their plan to force her to retire and break up her empire so the pieces can be sold.
Split into simpler sentences: On their arrival in New York, Emma's secretary, Gaye, tells her about a plot she heard Emma's sons discussing. They plan to force Emma to retire and then break up her empire so the pieces can be sold.