Complex sentence: According to eyewitness accounts by street cleaners who were working around the Palazzo Ducale there was a sudden bright flash of light in the area at around 3 a.m. At first they did not realise that the flame was a burning man.
Split into simpler sentences: According to eyewitness accounts by street cleaners who were working around the Palazzo Ducale there was a sudden bright flash of light in the area. They did not at first realise that the flame was a burning man.