Complex sentence: It was to be played back by using the now long-extinct Dynaco or EV Stereo-4 decoders, but the recording (LP or CD) can be played back in Quad by most of today's audio-video receivers.
Split into simpler sentences: It was to be played back by using the now long-extinct Dynaco or EV Stereo-4 decoders. The recording (LP or CD) can be played back in Quad by most of today's audio-video receivers.