Complex sentence: She has run away from home to be with Sun. Although the loves her, he expresses his sorrow at not being able to provide her with a home, but in loving him, she is confident that they will face the world together.
Split into simpler sentences: She has run away from home to be with Sun, although he expresses his sorrow at not being able to provide her with a home, albeit that he does love her. In loving him, she is confident that they will face the world together.