Complex sentence: The second channel (PBS2) transmits on 574 kHz (522 meters at 20 kW) and the first channel, PBS 1, is moved slightly to 677 kHz (443 meters), which allows it to be heard better in Europe.
Split into simpler sentences: The second channel (PBS2) transmitted on 574 kHz (522 meters at 20 kW). The first channel, PBS 1, was moved slightly to 677 kHz (443 meters), which allowed it to be heard better in Europe.