Afaik this is a Quake 2 engine limit, it has nothing to do with the editor or bsp compiler. While one could of course alter the code of clients like r1q2 and raise the limits, this would still leave the map broken for all other engines (this situation exists in the Quake 1 community, most SP maps released for Q1 today can only be played with special engines, the original quake.exe just crashes for them).
I think the easiest way is to remove unimportant brushes that create many faces (detail stuff like broken glass, those wood planks etc).
Like spirit said, I think the main problem is the small stuff you have put on the ground (looks like broken up wood, or something!) It will really mess up the tris in your map!
Like you see in the image above, the 20 sided pillar to the left, is standing 1 unit higher than the "ground", and the one to the right is standing on the ground! You can imagine how many tris you'll get from the stuff you have on the ground in your map..
This is how the map look like in the editor..
Last Edit: Dec 3, 2010 6:29:41 GMT -5 by _SK3L3T0R_