Complex sentence: Aurora herself received negative reviews for her passivity and overall similarity to Snow White, and thus would remain Disney's last princess until "The Little Mermaid"'s Ariel debuted 30 years later in 1989.
Split into simpler sentences: Aurora herself received negative reviews for her passivity and overall similarity to Snow White. Aurora would remain Disney's last princess until "The Little Mermaid"'s Ariel debuted 30 years later in 1989.