Simplify the following text for a Grade 13 native English-speaking person.
Original: He made his solo debut on 6 January 1933 playing the Brahms Violin Concerto with the Warsaw Philharmonic Orchestra under Romanian conductor George Georgescu .
Simplified: He gave his first solo performance on 6 January 1933 playing the Brahms Violin Concerto with the Warsaw Philharmonic Orchestra .