Complex sentence: The five German divisions opposite were alert and well dug-in but X Corps captured Chilly and part of the woods in the centre of the corps front but was checked on the left at Bois Blockhaus copse, behind the German front line.
Split into simpler sentences: The five German divisions opposite were alert and well dug-in but X Corps captured Chilly and part of the woods in the centre of the corps front. The corps was checked on the left at Bois Blockhaus copse, behind the German front line.