Complex sentence: When they do, however, a shadowy figure appears from the portal, revealing himself to be Shadow Link, who then kidnapped the shrine maidens and sealed them in crystals, spreading them to various fortresses and strongholds throughout the kingdom.
Split into simpler sentences: When they do, however, a shadowy figure appears from the portal. This figure was Shadow Link, who then kidnapped the shrine maidens and sealed them in crystals, spreading them to various fortresses and strongholds throughout the kingdom.