Complex sentence: He then ordered a retreat via Mount Ebal, the column without guns or baggage, was fired on by artillery suffering few casualties before bivouacing at Tammun with the 16th and 19th Divisions at Tubas.
Split into simpler sentences: He then ordered a retreat via Mount Ebal, leaving behind all guns or baggage. During their withdrawal, the column suffered some casualties when fired on by artillery, before bivouacing at Tammun with the 16th and 19th Divisions at Tubas.