Complex sentence: Airspeed indicators in many Light and Recreational aircraft can only show the pilot Indicated Airspeed (IAS), for True Airspeed (TAS) other components would have to be added by the manufacturer.
Split into simpler sentences: Airspeed indicators in many Light and Recreational aircraft can only show the pilot Indicated Airspeed (IAS). For True Airspeed (TAS) other components would have to be added by the manufacturer.