Complex sentence: The event fanned nationalism among ethnic Chinese inside and outside of China, who viewed the event as a means by some western countries to instigate ethnic hatred, spread unrest in China and push the victims to pillory by violence.
Split into simpler sentences: The event fanned nationalism among ethnic Chinese inside and outside China. They viewed the event as a means by some western countries to instigate ethnic hatred, spread unrest in China and push the victims to pillory by violence.