Complex sentence: The battle began when Abad and his men fired a volley into the column of unexpecting soldiers, and then led a massive bolo rush onto their flanks, where there was bloody hand to hand fighting, the guerillas obviously enjoying the upperhand.
Split into simpler sentences: The battle began when Abad and his men fired a volley into the column of unexpecting soldiers, and then led a massive bolo rush onto their flanks. There was bloody hand to hand fighting, the guerillas obviously enjoying the upperhand.