If you mean you want the meaning/details of the sentence:
“I have to admit, the person who came up with this trick has an incredibly high IQ.”
It means: “I must acknowledge that the person who invented/discovered this clever trick is extremely intelligent.”
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“I have to admit” = I reluctantly/strongly acknowledge this.
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“came up with this trick” = thought of or invented this clever method.
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“incredibly high IQ” = exceptionally intelligent.
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“detail” isn’t needed at the end unless you meant something else by “detail.”
