Complex sentence: A militia was hastily assembled on the Arizona side of the border and sent in to help rout the rebels during the battle and on the next day Brigadier General Frank Wheaton dispatched elements of the 24th Infantry.
Split into simpler sentences: A militia was hastily assembled on the Arizona side of the border and sent in to help rout the rebels during the battle. On the next day Brigadier General Frank Wheaton dispatched elements of the 24th Infantry.