Complex sentence: Roach incites a mutiny against Brayker to take the key, but fails; instead, he encourages the others to escape through the old mine tunnels under the building and Brayker is unable to dissuade them.
Split into simpler sentences: Roach incites a mutiny against Brayker to take the key, but fails. Instead, he encourages the others to escape through the old mine tunnels under the building and Brayker is unable to dissuade them.