A jury would definitely be able to set the damages number, and have some sway on whether Google gets broken up. If a jury sets a huge number, the DOJ will be empowered to go for a breakup and the judge will be swayed toward agreeing.
Incidentally, I have been somewhat involved in a few court cases, and the general advice I have been told is to explain [extremely technical topic] at a 3rd grade level if you want a jury to understand.
By the way, for people who want to argue that people are getting stupider, apparently it was a 6th grade level 30 years ago.