Complex sentence: The fictional town of Jericho is portrayed as having a demographic trend opposite to what is actually found in western Kansas: there are no small towns in western Kansas that have grown from 1,000 to 5,000 in population in the past 50 years.
Split into simpler sentences: The fictional town of Jericho is portrayed as having a demographic trend opposite to what is actually found in western Kansas. There are no small towns in western Kansas that have grown from 1,000 to 5,000 in population in the past 50 years.