Complex sentence: Unable to find a suitable ford, during the night of 11/12 November the 2nd Light Horse Regiment swam their horses across the river, then captured the Turkish position on the Tel el Murre hill with a bayonet charge.
Split into simpler sentences: Unable to find a suitable ford, the 2nd Light Horse Regiment swam their horse across the river on 11 November during the night. Dismounting they captured the Turkish position on the Tel el Murre hill with a bayonet charge.