Complex sentence: Mama Odie tells the two frogs that since Charlotte is the princess of Mardi Grass and so only her kiss will break the spell, however this must be done before midnight since Charlotte is only a princess until then.
Split into simpler sentences: Mama Odie tells the two frogs that since Charlotte is the princess of Mardi Grass, and so only her kiss will break the spell. However this must be done before midnight since Charlotte is only a princess until then.