Complex sentence: The Burianek case hit the headlines again in 2012 and 2013 on account of a former Stasi officer, Colonel Wolfgang Schmidt, who used his internet site to describe Burianek as a "bandit" and as the "leader of a terrorist organisation".
Split into simpler sentences: The Burianek case hit the headlines again in 2012 and 2013 on account of a former Stasi officer, Colonel Wolfgang Schmidt. Schmidt used his internet site to describe Burianek as a "bandit" and as the "leader of a terrorist organisation".