Complex sentence: Russo's pursuit of Angela leads him to fall in love with her, and he is grief-stricken when she and her husband return to Europe, but the two women have arranged that Sam will take her place and nurse his broken heart.
Split into simpler sentences: Russo's pursuit of Angela leads him to fall in love with her. He is grief-stricken when she and her husband return to Europe, but the two women have arranged that Sam will take her place and nurse his broken heart.