Complex sentence: Wanting to resume her relationship with Ray, she comes to believe that the surest way to do this would be to endanger another loved one of a hero, sending all of the superheroes, including Ray, running back to their spouses and other relatives.
Split into simpler sentences: Wanting to resume her relationship with Ray, she came to believe that the surest way to do this was to endanger the loved one of another superhero. She believd that this would send all of the superheroes, including Ray, running back to their spouses and other relatives.