Complex sentence: The town is an important crossing point on the River Barrow, being located between the river estuary, and the point where the River Nore joins the Barrow and was the location of one of the bloodiest battles of the 1798 rebellion.
Split into simpler sentences: The town is a geographically important crossing point sighted where it is on the River Barrow due to it being located between the river estuary to the south and the point where the River Nore joins the Barrow to the north. It was the location of one of the bloodiest battles of the 1798 rebellion.