Complex sentence: It proved to be highly successful, being well-planned and executed and under the cover of darkness with a carefully laid deception plan, the commandos managed to sneak up behind the hills, moving thorough the Italian forward positions unchallenged.
Split into simpler sentences: It proved to be highly successful, being well-planned and executed, with a carefully laid deception plan. Under the cover of darkness the commandos managed to sneak up behind the hills, moving thorough the Italian forward positions unchallenged.