Complex sentence: Heavy taxes were imposed upon the Uyghurs by the Dzungars, with women and refreshments provided by the Uyghurs to the tax collectors, and periodically Uyghur women were gang raped by the tax collecters when the amount of tax was not satisfactory.
Split into simpler sentences: Heavy taxes were imposed upon the Uyghurs by the Dzungars, with women and refreshments provided by the Uyghurs to the tax collectors. Periodically, Uyghur women were gang raped by the tax collectors when the amount of tax was not satisfactory.