Input (grade 13): When Aeschylus first began writing, the theater had only just begun to evolve, although earlier playwrights like Thespis had already expanded the cast to include an actor who was able to interact with the chorus.
Output (grade 6): When Aeschylus first began writing, the theater was new. Some playwrights like Thespis had made the cast bigger to include an actor who was able to talk with the chorus.