Complex sentence: Prior to widespread use of synthesizers, radio and television receivers relied on manual tuning of a local oscillator, such as with the turret tuner commonly used in television receivers prior to the 1980s.
Split into simpler sentences: Prior to widespread use of synthesizers, radio and television receivers relied on manual tuning of a local oscillator. Some might remember the classic turret tuner commonly used in television receivers prior to the 1980s.