Complex sentence: When Joe's wife and son arrive, Maggie and Steve, it quickly becomes apparent that Maggie is avoiding dealing with the prospect of her future without Joe and refuses to enter their cabin, while Steve has no idea of his father's impending death.
Split into simpler sentences: When Joe's wife and son, Maggie and Steve, arrive, it quickly becomes apparent that Maggie is avoiding dealing with the prospect of her future without Joe. She refuses to enter their cabin, while Steve has no idea of his father's impending death.