I can explain the Dark Empire in 50 words and it isn't even a guild. (This is not an example of what I'd let pass, since the Dark Empire isn't a guild, but an organization.)
Structure: The Dark Empire is an organization of several guilds where the members are placed in a transversal hierarchy of three levels called "Councils." It is also divided into Forces, each pertaining to a field of action (magic, war, intelligence and knowledge). - 41 words
History: The Dark Empire was founded by a diaboli as an effort to create a community of ambitious spirits with rules autonomous from the Octarchy. It's shady reputation has seen it through many trials, but it has always sided with the interests of the government. - 45 words
You just need to know what to highlight. Obviously people will be able to hide some stuff or lie, but at least this type of stuff won't pass:
Name: Troops of Mordor
Name: Herias
wrong ->Structure: Herias imitates the style of the mafia. The Godfather, which is the boss, sends his orde--
History: Because of the lack of order amongst criminals, Herias Guild was installed in Hydlaa by Fargurson, as an attempt to gather under his banner criminal minds of talent. Besides being chased by the Guard, the guild goes without much trouble.
Name: Eyes Without Sight
Structure: The structure of this guild is pretty simple. There are no ranks and everyone can be invited, however everyone must respect the "orders" which are a monthly decree of things the members have to do or else be banned.
History: Tervir, a friend of Talad's, once had an idea. "Man, it'd rock if we had this guild where we would give out orders without anyone knowing who is the leader."
EDIT to add example:
Name: The Finest
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Structure: In tis guild u hav 2 blong --