Complex sentence: She was featured in the Broadway play "Three Days of Rain", in which she was the understudy for Julia Roberts in the roles of Nan and Lina; and appeared as Allison in the Atlantic Theatre Company's production of "Anon" in 2007.
Split into simpler sentences: She was featured in the Broadway play "Three Days of Rain", in which she was the understudy for Julia Roberts in the roles of Nan and Lina. She also appeared as Allison in the Atlantic Theatre Company's production of "Anon" in 2007.