Complex sentence: In an unlockable extended ending, it is discovered that the protagonist is the lost prince of Argonia, and upon this revelation, the King of Argonia decides to allow the protagonist to marry Medea.
Split into simpler sentences: In an unlockable extended ending, it is discovered that the protagonist is the lost prince of Argonia. Because he is a prince, the King of Argonia decides to allow the protagonist to marry Medea.