Complex sentence: Meldrum's Force left Kh Fusail at midnight on 22 September with the Auckland Mounted Rifles Regiment as vanguard advancing across a narrow plain hemmed in by the Judean Hills on the left and exposed to enemy artillery on the eastern side of the river.
Split into simpler sentences: Meldrum's Force left Kh Fusail at 24:00 on 21/22 September, with the Auckland Mounted Rifles Regiment as advanced guard. They approached across a narrow plain hemmed in by the Judean Hills on the left and exposed to enemy artillery on the eastern side of the river.