Hi Antonia,

Here is the sentence with some changes.

One of the possible reasons for insufficient attention from the academic publicity/audience/experts(I don't know which of these choices best suits your meaning)  probably lies in the fact that, until recently, negotiation was considered to be an exclusively  business or diplomatic skill possessed by especially capable and talented individuals and people of great experience in business or politics.

However, I think it has no clear focus because it is too long. I prefer a shorter and more direct approach. 

Academic experts have not paid enough attention to negotiation. One possible reason is probably that, until recently,  negotiation was considered to be an exclusively  business or diplomatic skill. This skill was seen as being possessed by especially capable and talented individuals and by people of great experience in business or politics. I don't see how this last (pink) sentence relates to the lack of attention. You need to make your meaning clearer about this, or remove the sentence.

Best wishes, Clive