Complex sentence: Fedor, a debutante, became well-known in Boston society before her entrance into the theater.She made her stage debut in "Leah Kleschna" with the stock company of Minnie Maddern Fiske at the Manhattan Theatre, Broadway (Manhattan) and 33rd Street.
Split into simpler sentences: Fedor, a debutante, became well-known in Boston society before her entrance into the theater. The premiere occurred at the Manhattan Theatre, Broadway (Manhattan) and 33rd Street.