Complex sentence: On the evening of 11 May the French captured the lower slopes of the Arabs' Spur in fighting which was costly to both sides and night counter-attack by German troops from the Spur of the White Way was repulsed.
Split into simpler sentences: On the evening of 11 May the French captured the lower slopes of the Arabs' Spur after an attack costly to both sides. A night counter-attack by German troops from the Spur of the White Way was repulsed.