Complex sentence: CBS was inundated with thousands of angry letters protesting the plot development, "Rhoda" and "Joe" received sympathy cards and letters of condolence, and Groh even receiving hate mail.
Split into simpler sentences: CBS was inundated with thousands of letters protesting the plot development. Both "Rhoda" and "Joe" received sympathy cards and letters of condolence from fans, with Groh even receiving hate mail.