Complex sentence: The insurgents sneak into Wayne Manor, and after fighting the alternate Wonder Woman, Killer Frost, Solomon Grundy, and Black Adam, they enter the Batcave and retrieve the kryptonite weapon.
Split into simpler sentences: The insurgents sneak into Wayne Manor, where they fight the alternate Wonder Woman, Killer Frost, Solomon Grundy, and Black Adam. The heroes are able to enter the Batcave and retrieve the kryptonite weapon.