Just like a row of books will start to lean when the bookends that support it are removed, fault blocks of the Earth's crust can rotate and deform.
(fault blocks of the Earth's crust; deform; ) (the bookends; support; it) (the bookends that support it; are removed; ) (fault blocks of the Earth's crust; can rotate; )
fault blocks of the Earth's crust the bookends the bookends that support it fault blocks of the Earth's crust
deform support are removed can rotate
it