Complex sentence: The Sonata for Piano and Violin in A-major was listed as K61 and first appeared under Mozart's name in the Breitkopf & Härtel "OEuvres" in 1804.
Split into simpler sentences: The Sonata for Piano and Violin in A-major that was listed as K61. This Sonata first appeared under Mozart's name in the Breitkopf & Härtel "OEuvres" in 1804.