Complex sentence: The blockade was violently suppressed by RCMP, who used attack dogs on unarmed men, women, and children shortly after the main railway bridge in Seton Portage was destroyed by an arsonist.
Split into simpler sentences: The blockade was violently suppressed by RCMP, who used attack dogs on unarmed men, women, and children. Shortly afterward, the main railway bridge in Seton Portage was destroyed by an arsonist.