Complex sentence: She directed a new production of "Lucia Di Lammermoor" at the Metropolitan Opera, which premiered September, 2007; her production of Vincenzo Bellini's "La sonnambula" premiered there in March, 2009.
Split into simpler sentences: She directed a new production of "Lucia Di Lammermoor" at the Metropolitan Opera, which premiered September, 2007. Zimmerman's production of Vincenzo Bellini's "La sonnambula" premiered there in March, 2009.