Original sentence: In August 1969 he took part in the Sopot International Song Festival in Poland where the then 19-year old successfully conducted a symphony orchestra and won a prize with his first grand composition Le valse d'enfance (engl
Edited sentence: In August 1969 he took part in the Sopot International Song Festival in Poland where the then 19-year old successfully conducted a symphony orchestra and won a prize with his first grand composition La valse de l'enfance (engl