Here is the full text as a PDF along with a cover letter explaining why and how it was released. It's only 6 pages so you should read it yourself, but the gist is the DNC paid an FBI informant to first fabricate and then leak information about someone on Trump's campaign team to Yahoo news. He then used the information he fabricated to compile a dossier on the man, claim that he was working for Russia, and apply for a FISA grant so the DNC could spy on him. While I normally don't give a shit who spies on who, that's my motherfucking tax money going to spying on this dude. Fusion GPS was implicated as the source of the funds so hopefully the whole organization will implode and another piece of scum will be peeled from the earth.