Hi Backstory has been pretty much pieced together from the various books and comics that have been released
http://starwars.wikia.com/wiki/Snoke
However when they had the "Comedy" moment when Snoke's top half and bottom half slid off of the throne, I said to myself "That's it for him". The only thing missing was when Hux asked Ren what happened to Snoke, that Ren didn't reply with a "He had to split" line