Complex sentence: ABC apparently ordered 13-episodes for the new show slated for fall 1998 in which Mary and Rhoda are widowers who each have a 20-something daughter named after the other (Mary's daughter is named Rhoda and Rhoda's daughter is named Mary).
Split into simpler sentences: ABC apparently ordered 13-episodes for the new show slated for the fall of 1998. The show's premise would have featured Mary and Rhoda as widowers who each have a twenty-something daughter named after the other (Mary's daughter is named Rhoda and Rhoda's daughter is named Mary).