Simplify the following text for a Grade 5 native English-speaking person.
Original: The opera was commissioned by the Venice Biennale and given its world premiere on September 14 , 1954 , at the Teatro La Fenice , Venice .
Simplified: Britten was asked by the Venice Biennale to write the opera . It was first performed on 14 September , 1954 , at the Teatro La Fenice , Venice .