Complex sentence: In the early radios the multiple tuned circuits required multiple knobs to be adjusted to tune in a new station, and one of the most important ease-of-use innovations was "single knob tuning", achieved by linking the tuning capacitors together mechanically.
Split into simpler sentences: In the early radios the multiple tuned circuits required multiple knobs to be adjusted to tune in a new station. One of the most important ease-of-use innovations was "single knob tuning", achieved by linking the tuning capacitors together mechanically.