Complex sentence: Her crowning theater achievement was her appearance in the Wendy Wasserstein play "An American Daughter" in 1997, which won her Tony Award for Best Performance by a Featured Actress in a Play for her portrayal of "Dr. Judith Kaufman".
Split into simpler sentences: Her crowning theater achievement was her appearance in the Wendy Wasserstein play "An American Daughter". She won a Tony Award in 1997 for her portrayal of "Dr. Judith Kaufman".