Complex sentence: This is the general and most appropriate term used for high voltage propulsion devices in which, unlike their relative ion thruster family, do not need to carry their own gas supply, although they still require to carry their own electrical power source or generator.
Split into simpler sentences: This is the general and most appropriate term used for high voltage propulsion devices. EHD thrusters, unlike the related ion thruster family, do not need to carry their own gas supply, although they still need to carry their own electrical power source or generator.