Original sentence: It was not until 1 May 1899 that Chekhov saw the production, in a performance without sets but in make-up and costumes at the Paradiz Theatre.The production opened on 17 December 1898.The production opened on 17 December 1898 with a sense of crisis in the air in the theatre; most of the actors were mildly self-tranquilised with Valerian drops
Edited sentence: It was not until  that Chekhov saw the production, in a performance without sets but in make-up and costumes at the Paradiz Theatre.The production opened on.The production opened on  with a sense of crisis in the air in the theatre; most of the actors were mildly self-tranquilised with Valerian drops