Complex sentence: In his youth he won a scholarship of three years' study at the National Conservatory, where he studied with Antonín Dvořák, and quickly became a favored pupil of the Bohemian composer.
Split into simpler sentences: In his youth he won a scholarship of three years' study at the National Conservatory. There he studied with Antonín Dvořák, and quickly became a favored pupil of the Bohemian composer.