Complex sentence: The Ardennes is well known because of the Battle of the Bulge, when the German Army launched a surprise attack in December 1944 in an attempt to capture Antwerp and drive a wedge between the British and American forces in northern France.
Split into simpler sentences: The Ardennes is well known because of the Battle of the Bulge. The German Army launched a surprise attack in December 1944 in an attempt to capture Antwerp and drive a wedge between the British and American forces in northern France.