Complex sentence: Edgar is said to be constitutionally weak, as is the case throughout the Linton family, and is very distressed when he realizes that he cannot match the fire and passion of his wayward wife and her soul mate.
Split into simpler sentences: Edgar is said to be constitutionally weak, as is the case throughout the Linton family. He becomes very distressed when he realizes that he cannot match the fire and passion of his wayward wife and her soul mate.