Complex sentence: Fischer was born in then Federation of Rhodesia and Nyasaland (Zambia) to Swiss parents who had been missionaries and studied flute with Aurèle Nicolet and began his musical career as Principal Flute in Hamburg and at the Zurich Opera, where he studied scores with Nikolaus Harnoncourt.
Split into simpler sentences: Fischer was born in then Federation of Rhodesia and Nyasaland (Zambia) to Swiss parents who had been missionaries. He studied flute with Aurèle Nicolet and began his musical career as Principal Flute in Hamburg and at the Zurich Opera, where he studied scores with Nikolaus Harnoncourt.