Complex sentence: Fitted with automatic power management, the vessel can be operated with her machinery spaces unmanned-as with her sister ships, her engines can be controlled from either the ship's bridge or the (air conditioned) machinery control room.
Split into simpler sentences: Fitted with automatic power management, the vessel can be operated with her machinery spaces unmanned. And as with her sister ships, her engines can be controlled from either the ship's bridge or the air conditioned machinery control room.