Complex sentence: In the realm of chamber music, Bruch is not well known, althoigh he is remembered for his "Eight Pieces for Clarinet, Viola and Piano" that became part of the popular repertory due to the rare combination of instruments.
Split into simpler sentences: In the realm of chamber music, Bruch is not well known. He is remembered for the Eight Pieces for Clarinet, Viola and Piano that did spend some time in the repertory due to its rare combination of instruments.