Complex sentence: With the decline of Morse code the station was retired, but volunteers have preserved it in operating condition so that it can still be heard on the air on weekends and special occasions, also using the alternative callsign KSM and the amateur radio callsign K6KPH.
Split into simpler sentences: With the decline of Morse code the station was retired, but volunteers have preserved it in operating condition so that it can still be heard on the air on weekends and special occasions. They also use the alternative callsign KSM and the amateur radio callsign K6KPH.