Complex sentence: The Wehrmacht forces for the Ardennes Offensive were the product of a German recruitment effort targeting German males between the ages of 16 and 60, to replace soldiers lost during five months of fighting against the Western Allies in France.
Split into simpler sentences: The Wehrmacht forces deployed for the Ardennes Offensive were the product of a German recruitment effort targeting all German males between the ages of 16 and 60. The need for more soldiers was the result of five months of fighting against the Western Allies in France.