Complex sentence: Angel turns the tables on Lindsey, and starts to beat him all the while apologizing that Darla will never love him and that he didn't try harder to save Lindsey when he came to him for help.
Split into simpler sentences: Angel turns the tables on Lindsey, and starts to beat him all the while apologizing. Apologizing that Darla will never love him and that he didn't try harder to save Lindsey when he came to him for help.