Complex sentence: Eyre, after receiving reinforcements, pursued Kunwar Singh's forces to Singh's palace in Jagdispur; many civilians who were besieged in Arrah, including Wake (and the 50 men of the Bengal Military Police Battalion), volunteered to serve with him.
Split into simpler sentences: Eyre, after receiving reinforcements, pursued Kunwar Singh's forces to Singh's palace in Jagdispur. Many civilians who were besieged in Arrah, including Wake (and the 50 men of the Bengal Military Police Battalion), volunteered to serve with him.