Not that I know of.
I can't find anything either, now that I actually look. The best I can
find is a very brief summary at the top of [[Wikipedia:GFDL
compliance]].
I even emailed the FSF for clarification and got
back that simplifications are oversimplifications and people really do
need to read the license.
That's just what I was saying - you can't have an official
simplification, since it would end up conflicting with the actual
license.
My goodness the GFDL is a crap license for a wiki ...
Too late to do anything about that now, though...