Simplify the following text for a Grade 8 native English-speaking person.
Original: In 1939 , he premiered Francis Poulenc 's Organ Concerto ( the Concerto for Organ , Strings and Timpani in G minor ) ; he had advised Poulenc on the registrations of the organ part .
Simplified: In 1939 , he gave the first performance of Francis Poulenc 's Organ Concerto .