Complex sentence: The Duke gives Shadow the Scepter of Darkness, which he uses to seal Mephiles, while Silver and the Duke seals Iblis into a young Elise's tears, the dying Duke asks his daughter not to cry for her tears could release Iblis.
Split into simpler sentences: The Duke gives Shadow the Scepter of Darkness, which he uses to seal Mephiles, while Silver and the Duke seal Iblis into a young Elise's tears. The dying Duke asks his daughter not to cry for her tears could release Iblis.