Simplify the following text for a Grade 5 native English-speaking person.
Original: 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 .
Simplified: 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 .