Original sentence: The first movement, Introitus: Requiem Aeternam was commissioned by the London Sinfonietta as part of a memorial concert for Artistic Director Michael Vyner who died on the 20th of October, 1989
Edited sentence: The first movement, Introitus: Requiem Aeternam was commissioned by the London Sinfonietta as part of a memorial concert for Artistic Director Michael Vyner who passed away on the 20th of October, 1989