Complex sentence: The protagonist, a direct participant in the operation, went to the roof himself and brought people there after robotics failed, and, at the government level, it was decided to throw in soldiers and cadets of military schools for cleaning the roofs.
Split into simpler sentences: The protagonist, a direct participant in the operation, went to the roof himself and brought people there after a failed attempt to clear the area with robots. At the government level, it was decided to assign soldiers and cadets of military schools to the task of cleaning the roofs.