simple english please

I Think that those books made for research purposes are always going to be hard to read and understand and can even result in headaches. Even biographies can do this, but I've found autobiographies to be less of a headache as most of the time the one writing the book is a not a scholar at writing and therefore uses simpler terms as if he or even she is talking to you. As for using words that are unfamiliar or difficult to understand first you must look at the author, is he or she from a different country? Most likely it's translated. Okay the copyright dates. Is it an older book? Then the language say ten years ago is most likely going to be different then that of now. Even the style will be different. What genre is it set in? Is it 1800's? Some authors will try to make you feel like your in the book and at the same time make it easier to transition from one part to the next, therefore they use words that you normally wouldn't think would be said now a days. Especially if the character is speaking it, if they are an older character (I.E. Grandpa, grandma) then their way of talk will be different. Sometimes an author will use words that are generally found in different "cultures" or areas. Such as southern slang. Ain't might be used in a book about slaves or farming, and even about country life... where in Dawg or something of that nature will be used to pertain to someone who lives up North. Well I hope that this helped!