Complex sentence: British troops, backed up by French infantry attempted to hold the line here but the French received orders to retreat, leaving the British flank exposed; the British retreated with the French and fell back through Berlancourt to Guiscard.
Split into simpler sentences: British troops, backed up by French infantry attempted to hold the line here but the French received orders to retreat, leaving the British flank exposed. The British retreated with the French and fell back through Berlancourt to Guiscard.