Complex sentence: Drivers reported having stones tossed at their cars, the city came to a standstill as billowing smoke could be seen rising from parts of the city and reports of sniper fire at freeway drivers stopped traffic until the guard could restore order.
Split into simpler sentences: Drivers reported having stones tossed at their cars, and the city came to a standstill as smoke billowed from parts of the city. Reports of sniper fire at freeway drivers also stopped traffic until the guards could restore order.