Complex sentence: From that moment, Sevilla became the exclusive star of Producciones Calderón, and although she had offers from Metro-Goldwyn-Mayer and Columbia Pictures, she turned them down for not being interested in working in Hollywood.
Split into simpler sentences: From that moment, Sevilla became the exclusive star of Producciones Calderón. Meanwhile, she had offers from studios such as Metro-Goldwyn-Mayer and Columbia Pictures, but she turned them down for the reason that she was not interested in working in Hollywood.