Complex sentence: Typically the transmitter multiplexes all the channels into a single pulse-position modulation radio signal, and the receiver demultiplexes and translates it to the special kind of pulse-width modulation used by standard RC servos.
Split into simpler sentences: Typically the transmitter multiplexes all the channels into a single pulse-position modulation radio signal. The receiver demodulates and demultiplexes the signal and translates it to the special kind of pulse-width modulation used by standard RC servos.