Complex sentence: The remainder of the column, carrying their injured, fled over the mountains to Skerdagh, where they had safe houses.However the British tracked them there and, in another exchange of fire, another IRA man was killed.
Split into simpler sentences: The remainder of the column, carrying their wounded, fled over the mountains to Skerdagh, where they had safe houses. However, the British tracked them there and, in another exchange of fire, another IRA man was killed.