Даны два предложения,найдите оплошности и исправьте их 1)These conserts were performed

1. Первое предложение - это форма страдательного залога Past Perfect. Тут применима конструкция had been + performed.

These concerts had been performed by first international conductors Leopold Stokowski, Georg Solti and Carlo Maria Giulini.

2. 2-ое предложение - это страдательный залог в Past Indefinite. Применяем конструкцию was + performed.

The first foreign orchestra, Moscow Radio Orchestra, was performed in 1966.