Complex sentence: She made her stage debut in 1885, as part of an amateur theater group, and by 1887, she had appeared with a professional troupe in the Alexandre Dumas play "Kean" in the Petrovsky Park in Moscow.
Split into simpler sentences: She made her stage debut in 1885, as part of an amateur theater group. By 1887, she had appeared with a professional troupe in the Alexandre Dumas play "Kean" in the Petrovsky Park in Moscow.