reference of a sentence
"Aristotle, however, disagreed with the notion of a Platonic ideal and believed the forms to be simply characteristics of concepts we had arrived at through actual experience."

Do you think whether "we had arrived at through actual experience" goes to "characteristics of concepts" or "concepts"?

Question

reference of a sentence
"Aristotle, however, disagreed with the notion of a Platonic ideal and believed the forms to be simply characteristics of concepts we had arrived at through actual experience."

Do you think whether "we had arrived at through actual experience" goes to "characteristics of concepts" or "concepts"?

Answer

Do you think whether "we had arrived at through actual experience" goes to "characteristics of concepts" or "concepts"?

Your usage of "whether" here doesn't make sense.

Now, in response to your question, it's just "concepts", as "characteristics" is relevant to the "forms"