Complex sentence: Meanwhile the left column of 2nd Guides was caught by an Ottoman barrage which caused 54 casualties before the leading companies reached the Ottoman wire, but by 05:40 all three Ottoman trench lines were captured with more than 100 prisoners.
Split into simpler sentences: Meanwhile the left column of 2nd Guides was caught by an Ottoman artillery barrage which caused 54 casualties before the leading companies reached the Ottoman wire. By 05:40 all three Ottoman trench lines were captured with more than 100 prisoners.