Complex sentence: He later held positions as a theater conductor in Szczecin and Wroclaw, he was a musical assistant at the Bayreuth Festival, and later as head of the Chamber Music Department at Radio Cologne.
Split into simpler sentences: He later held positions as a theater conductor in Szczecin and Wrocław. He was a musical assistant at the Bayreuth Festival, and later was head of the Chamber Music Department at Radio Cologne.