Complex sentence: She says that she doesn't want to be his Jianghai, depriving him of his dreams and holding him back and apologizes for saying goodbye in a selfish way, saying it pains her to break up with him.
Split into simpler sentences: She says that she doesn't want to be his Jianghai, depriving him of his dreams and holding him back. She apologizes for saying goodbye in a selfish way, and that it pains her to break up with him.