Complex sentence: The pilot tone frequency is 3.5 times line frequency (54687.5 Hz) and the modulated tone frequency is 117.5 Hz for stereo transmission and 274.1 Hz for dual sound.
Split into simpler sentences: The pilot tone frequency is 3.5 times line frequency (54687.5 Hz). The modulated tone frequency is 117.5 Hz for stereo transmission and 274.1 Hz for dual sound.