Complex sentence: Later he accompanied the Avengers to the Kree Empire in a last-ditch effort to intervene on humanity's behalf, and after the destruction of the Supreme Intelligence, he became the new Kree leader.
Split into simpler sentences: Later he accompanied the Avengers to the Kree Empire in a last-ditch effort to intervene on humanity's behalf. After the shut down of the Supreme Intelligence, he became the new Kree leader.