That which had been...

That which had been needed to be done had been done.

(The Guardian.)

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That which had been needed to be done had been done - a main clause;

That which had been needed to be done - a subject (a noun phrase), where:

That - the head of the noun phrase (a pronoun);

which had been needed to be done - the adjectival modifier (a relative clause) where:

which - a subject (relative pronoun);

had been - a linking verb;

needed to be done - a complement (of the subject which);

had been done - a predicator of the sentence (a verb phrase) where:

had been - the auxiliary verb (of be);

done - the main verb of the VP had been done.

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