Complex sentence: Ludwig van Beethoven's "Piano Sonata No.26 in E flat major", opus 81a, known as the "Les Adieux" sonata, was written during the years 1809 and 1810.
Split into simpler sentences: Ludwig van Beethoven's "Piano Sonata No.26 in E flat major", opus 81a, known as the "Les Adieux" sonata. It was written during the years 1809 and 1810.