Complex sentence: He manages to work up enough courage to confess his love to her, and it begins to look as if a relationship between them might actually appear... until Kyoko meets the rich, handsome, and charming Shun Mitaka.
Split into simpler sentences: He manages to work up enough courage to confess his love to her, as it begins to look as if a relationship between them might actually appear. Until then, Kyoko meets the rich, handsome, and charming Shun Mitaka.