Complex sentence: Riehl initially took a position in German industry with Auergesellschaft, where he became an authority on luminescence; while he did completed his Habilitation, he continued his industrial career at Auergesellschaft, as opposed to one in academia.
Split into simpler sentences: Riehl initially took a position in German industry with Auergesellschaft, where he became an authority on luminescence. While he completed his Habilitation, he continued his industrial career at Auergesellschaft, as opposed to working in academia.