When to use had been and have been

The person from whom I have been getting some helpful advices whenever needed has been migrated to different place

The person from whom I had been getting some helpful advices whenever needed has been migrated to different place
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The person from I had been getting helpful advice whenever I needed it has migrated.
Wonder123had been and have been
The person who has been giving me helpful advice [until now] has moved.
(You are still getting advice at the time of the move.)

The person who had been giving me helpful advice [until some time ago] has moved.
(You stopped getting advice before the time of the move.)

CJ
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Ok thanks, are my original sentences grammatically correct?
Wonder123Ok thanks, are my original sentences grammatically correct?
No. That's why I changed them.

CJ
Ok, What changes do I need to make to my original sentences to make them grammatically valid. Actually I want to keep the sentence structure/style as it is and still make it grammatically correct, is it possible.
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Wonder123What changes do I need to make to my original sentences to make them grammatically valid
It seems to me that CJ has addressed this issue, Re-read his posts.
Along the advice given by others, this is my added two cents. If you insist on using this constructon and ask the volunteers to help you improve, bluntly, there isn't much we can impppprove based on the o.p. sentences. Like building a house, if the foundation and frame were out of plumb the rest of the structure will not be squared. I am sorry to tell you that this is the kind of phrasing I would advise others to avoid. If you can, "whom" is a word to be avoided. I don't remember if I had used this word (whom) at all in the last 15 years. Beside, either version sounds idiomatic, nor semantically smooth. CJ is right.
Yes I did, suppose if I would want to re-write the sentence of CJ in third person, how would the structure of the sentence be?
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