Complex sentence: The hero Star-Lord eventually imprisons the Fallen One in the inter-galactic prison the Kyln, although the character escapes when the Kyln is destroyed in a conflict between Thanos and the entity the Maker.
Split into simpler sentences: The hero Star-Lord eventually imprisons the Fallen One in the inter-galactic prison the Kyln. The Fallen One escapes when the Kyln is destroyed in a conflict between Thanos and the entity the Maker.