Here's a short version of what I believe to be Dunccan's point, simplified for you slower ones.
I'm Mercinaen. I'm good. Sorcerers are evil. I want the Sorcerer's skillset. I can't get in the Sorcerers' to get their skillset because they don't allow good people in. I'm going to make a new guild to let good people have the Sorcerers' skillset, so I can have it. Ha ha, Sorcerers, I have your skillset, anyway.
Were those sentences small enough?
-- Valek Ra
Written by my hand on the 24th of Eleuthral, in the year 1132.