Complex sentence: Born in Bonn, his German mother was the classical singer Emmy Kreiten-Barido, nee Liebergesell and his Dutch father Theo Kreiten, a composer, concert pianist, and writer.
Split into simpler sentences: Born in Bonn, his German mother was the classical singer Emmy Kreiten-Barido. His Dutch father Theo Kreiten, was a composer, concert pianist, and writer.