Yes, I don't like the learning, but I think the whole phrase needs revision to avoid it. Now, if I only knew what learning on the basis of acquired knowledge means!
The author of this text divides the process of negotiation in several phases. This sentence explains, or at least should explain what generally happens in the phase 5. It relates to the revision of recently completed negotiations and it also relates to absorbing all the knowledge and experience that was accumulated in the recent negotiations or learning through or from
Densely populated. Lots of formal nouns and noun phrases, complex coordinated clauses, polysyllabic verbs, etc. As a result of the exacerbation by rather than aggravated by-- that kind of thing, you know. Even the most abstruse scientific papers throw in a simple one-clause declarative sentence from time to time.