Simulacra and Simulations

Well, this was an interesting 24 pages of mumble jumble. I don't quite understand what they are talking about. Even some of the words were difficult to understand and by the time I looked a word up in the dictionary, I forgot what I was reading. I was just overall frustrated. The only bit I sort of understood or what I have thought to understand from the reading is that signs and symbols have replaced meaning and reality. I don't know does any one know. This is definitely something you have to read over and over again and I am just not into this reading at all to do that. Please can someone help me understand this more clearly?