Simplify the following text for a Grade 10 native English-speaking person.
Original: In 1991 , for the first time , Gergiev conducted a western European opera company with the Bavarian State Opera in a performance of Modest Mussorgsky 's Boris Godunov in Munich .
Simplified: In 1991 Gergiev conducted the Bavarian State Opera in a performance of Modest Mussorgsky 's Boris Godunov in Munich .