Complex sentence: Rather than quell the uprising however, this action merely infuriated the strikers who then forced the militiamen to take refuge in a railroad roundhouse, and then set fires that razed 39 buildings and destroyed 104 locomotives and 1,245 freight and passenger cars.
Split into simpler sentences: Rather than quell the uprising however, these actions action infuriated the strikers, who forced the militiamen to take refuge in a railroad roundhouse. Strikers set fires that razed 39 buildings and destroyed 104 locomotives and 1,245 freight and passenger cars.