Complex sentence: An episode relating to the 2007 Boston bomb scare, entitled "Boston", was produced and set to air in 2008, but was pulled to avoid further controversy surrounding the incident, and has never aired or released to the public in any format.
Split into simpler sentences: An episode relating to the 2007 Boston bomb scare, entitled "Boston", was produced and set to air in 2008, but was pulled to avoid further controversy surrounding the incident. As of 2011 "Boston" has never aired or been released to the public in any format.