I do not perceive "it that finally decided you to give up your job" as a phrase.
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AnonymousIs my parsing acceptable?Yes, though 'you' functions both as the object of 'decide' and as the subject of the non-finite clause 'you to give up your job', so I would not call 'to give up your job' an object complement. It's the predicate of the non-finite clause. 'your job' is the direct object of 'give', of course, though you didn't mention
CalifJimso I think you could argue quite persuasively that the antecedent of the relative clause is 'what', not 'it'.Indeed.
CalifJim[It was what] that finally decided you to give up your job. > [What was it] that ...?Thank you for the detailed reply.