Complex sentence: He was one of the founders of the Henryk Wieniawski International Violin Competition, named after his famous uncle, and chaired the Jury of the International Piano Competition Fryderyk Chopin, in 1932 and 1937.
Split into simpler sentences: He was one of the initiators of the International Violin Competition Henryk Wieniawski, named after his famous uncle. He chaired the Jury of the International Piano Competition Fryderyk Chopin, in 1932 and 1937.