Complex sentence: He studied with Theodor Pollak, a professor and director of the Ludwik Marek School of Music in Lemberg, then with Emil von Sauer, a pupil of Liszt, at the Vienna Academy of Music.
Split into simpler sentences: He studied with Theodor Pollak, a professor and director of the Ludwik Marek School of Music in Lemberg. Then with Emil von Sauer, a pupil of Liszt, at the Vienna Academy of Music.