Complex sentence: The Coal and Iron Police was a private police force in the US state of Pennsylvania that existed between 1865 and 1931, it was established by the Pennsylvania General Assembly but employed and paid by the various coal companies.
Split into simpler sentences: The Coal and Iron Police was a private police force in the US state of Pennsylvania that existed between 1865 and 1931. It was established by the Pennsylvania General Assembly but employed and paid by the various coal companies.