Complex sentence: Money's Detachment was to cross the wadi mouth and hold a position in the sand dunes between the Rafa to Gaza road and the sea, to divert the Ottoman defenders attention, and cover a section of the 15th Heavy Battery.
Split into simpler sentences: Money's Detachment was to cross the wadi mouth and hold a position in the sand dunes between the Rafa to Gaza road and the sea. They were to divert the Ottoman defenders attention and cover a section of the 15th Heavy Battery.