Complex sentence: The importance of this is not to be overlooked as it was the turning point for Mussolini concerning his foreign standarding as he drifted away from Britain and France, and into the camp of Hitler's Germany.
Split into simpler sentences: The importance of this is not to be overlooked. It was the turning point for Mussolini concerning his foreign standarding as he drifted away from Britain and France, and into the camp of Hitler's Germany.