Complex sentence: It required a VCR to operate and used its own tuner and the VCR to display two television channels; the television antenna was plugged into the MultiVision unit, which was then plugged into the television receiver's antenna input.
Split into simpler sentences: It required a VCR to operate and used its own tuner and the VCR to display two television channels. The television antenna was plugged into the MultiVision unit, which was then plugged into the television receiver's antenna input.