Not in your example because "take care of" is a phrasal verb, and cannot be split. Look over there! That is the person of whom I was speaking.
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AnonymousI was wondering if there was a case in which "of whom" could be used where the prepositional phrase is taken off the end of the sentence and placed before whom.There are lots of cases like this, but the version with 'of whom' usually sounds very formal - too formal for ordinary conversation.
AnonymousThis is John of whom Kim is taking care.if a comma is added: This is John, of whom Kim is taking care. The relative clause is, after all, nonrestrictive/non-defining.