her own award-winning poem
... that Sylvia Plath criticized her own award-winning poem for its "old crystal-brittle and sugar-faceted voice"?
... that <a href="./Sylvia_Plath" id="mwAxg" rel="mw:WikiLink" title="Sylvia Plath">Sylvia Plath</a> criticized <b id="mwAxk"><a href="./Two_Lovers_and_a_Beachcomber_by_the_Real_Sea" id="mwAxo" rel="mw:WikiLink" title="Two Lovers and a Beachcomber by the Real Sea">her own award-winning poem</a></b> for its "old crystal-brittle and sugar-faceted voice"?