Complex sentence: Convinced that they have broken through the enemy lines, the soldiers decide to secure and wrapped in barbed wire, they realise they are perhaps not alone, though there is a great deal of confusion among them concerning why the Germans seem to have killed each other.
Split into simpler sentences: Convinced that they have broken through the enemy lines, the soldiers decide to secure. They find several bodies wrapped in barbed wire, and they realise they are perhaps not alone, though there is a great deal of confusion among them concerning why the Germans seem to have killed each other.