Complex sentence: The last bid to save Poland's independence was the Kościuszko Uprising in 1794, which failed and resulted in the Third Partition in 1795, as a a result of which Poland lost all its remaining territories and ceased to exist as a state.
Split into simpler sentences: The last bid to save Poland's independence was the Kościuszko Uprising in 1794. The uprising failed, though and resulted in the Third Partition in 1795, as a a result of which Poland lost all its remaining territories and ceased to exist as a state.