Complex sentence: He laid off Arnold Schönberg from the teaching staff of the Academy, in contravention of Schönberg's contract and in 1933, he ordered Franz Schreker, the leader of masterclasses in composition at the Academy, into early retirement.
Split into simpler sentences: He laid off Arnold Schönberg from the teaching staff of the Academy, in contravention of Schönberg's contract. As well, in 1933, he ordered Franz Schreker, the leader of masterclasses in composition at the Academy, into early retirement.