Complex sentence: Elsner taught the famous Polish composers Ignacy Feliks Dobrzyński and Fryderyk Chopin, the latter of whom dedicated to Elsner his Piano Sonata No.1, the "Sonata in C minor, Op.4", composed in 1828, while Chopin was studying with Elsner.
Split into simpler sentences: Elsner taught the famous Polish composers Ignacy Feliks Dobrzyński and Fryderyk Chopin. The latter dedicated to Elsner his Piano Sonata No.1 (the "Sonata in C minor, Op.4"), composed in 1828, while Chopin was studying with Elsner.