Complex sentence: In 1981, she performed role Édith Piaf for Pam Gems's play "Piaf" directed by Howard Davies on Broadway for which she won the Tony Awards Best Actress in a Play.
Split into simpler sentences: In 1981, she performed role Édith Piaf for Pam Gems's play "Piaf" directed by Howard Davies on Broadway. And she won Tony Awards Best Actress in a Play.