Complex sentence: The Avengers, torn apart after the events of', join forces with the Guardians of the Galaxy to battle Thanos, who is trying to amass the Infinity Stones for a gauntlet that will give him dominion over space, time, and all reality.
Split into simpler sentences: The Avengers, torn apart after the events of', join forces with the Guardians of the Galaxy to battle Thanos, who is trying to amass the Infinity Stones. A powerful being who longs to collect all the Infinity Stones for a gauntlet that will give him dominion over space, time, and all reality.