Complex sentence: When her brothers return, she hides, and they turn into human form and ask who has been at their food, but the last one finds the ring, and hopes it is their sister, in which case they are saved.
Split into simpler sentences: When her brothers return, she hides, and they turn into human form and ask who has been at their food. The last one finds the ring, and hopes it is their sister, in which case they are saved.