Could you please check whether the sentence below is grammatically correct. It is taken from context so it could sound not natural.
It was the case when Georgian officer was initially denied for the position in MARCOM, of which other Georgian officer had used to serve previously.
It was the case when a Georgian officer was initially denied for the position in MARCOM in which other Georgian officer had served previously.
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It was the case when a Georgian officer was initially denied for the position in MARCOM in which other Georgian officer had served previously.