Complex sentence: Born in Jyväskylä, the son of the composer Pekka Juhani Hannikainen (and brother of the pianist Ilmari Hannikainen and conductor Väinö Hannikainen), he studied first as a cellist in Helsingfors and abroad.
Split into simpler sentences: Born in Jyväskylä, he was the son of the composer Pekka Juhani Hannikainen. He studied first as a cellist in Helsingfors and abroad.