Complex sentence: Following these errors, Mangano fired Assessor Ted Jankowski, who had been appointed by Thomas Suozzi under much criticism, and was determined to be at fault for the errors not being caught.
Split into simpler sentences: Following these errors, Mangano fired Assessor Ted Jankowski. Jankowski had been appointed by Thomas Suozzi under much criticism, and was determined to be at fault for the errors not being caught.