Simplify the following text for a Grade 10 native English-speaking person.
Original: His chamber works include three string quartets , two string quintets , two string sextets , a clarinet quintet , a clarinet trio , a horn trio , a piano quintet , three piano quartets , and four piano trios ( the fourth being published posthumously ) .
Simplified: His chamber music includes string quartets , quintets and sextets and piano trios , quartets and a piano quintet .