Complex sentence: The fourth type of derailer is the Powered or Motorized Derailer, electronically powered through an actuator this type is of derailer could be controlled remotely from an external control panel or manually.
Split into simpler sentences: The fourth type of derailer is the Powered or Motorized Derailer, electronically powered through an actuator. This type is of derailer can be controlled remotely from an external control panel or manually.