Complex sentence: She's fiercely devoted to her country and the welfare of her people, and Christina has long since abandoned all thoughts of pursuing any kind of a romance--but changes her mind when she meets and falls in love with Spanish envoy Antonio (John Gilbert).
Split into simpler sentences: She's fiercely devoted to her country and the welfare of her people, and she has long since abandoned all thoughts of pursuing any kind of a romance. Yet, she changes her mind when she meets and falls in love with Spanish envoy Antonio (John Gilbert).