Complex sentence: It has been referred to as "the most important loudspeaker you never heard of", and has been used to monitor a very large number of successful recordings, including "Avalon" by Roxy Music.
Split into simpler sentences: It has been referred to as "the most important loudspeaker you never heard of". Thus, it has been used to monitor a very large number of successful recordings, including "Avalon" by Roxy Music.