Complex sentence: The Pittsburgh railway riots occurred in Pittsburgh, Pennsylvania, as part of the Great Railroad Strike of 1877 in the United States, incidents of strikes, labor unrest and violence in numerous cities across the country, and one of several in Pennsylvania.
Split into simpler sentences: The Pittsburgh railway riots occurred in Pittsburgh, Pennsylvania, as part of the Great Railroad Strike of 1877. It was one of many incidents of strikes, labor unrest and violence in cities across the United States, including several in Pennsylvania.