The full title is "Simplify Your Life: 100 Ways to Slow Down and Enjoy the Things That Really Matter". This was an interesting book. It's short, and has 100 specific things that you can do to change your life and make it more simple, just like the title says. Some of the tips may be things you haven't thought of, such as one for women "Pick a simple classic style that looks good on you, then stick with it. Forever."
Mainly the topic of simplify your life can be summed up with do less and have less. That will reduce complexity in your life. Get rid of your phone, car, cable, magazines, and clothes. Don't go out to eat much, or to movies, or to parties. Now your life is simple, you can sit at home and read or talk or play games.
The individual tips are worth thinking about, although if I were to implement everything, my life would be so boring that I would need the escapism of books to get through the day. But I can look at my wardrobe and TV and other habits to see if they are maybe overly complicated and are taking time that they shouldn't be.
I recommend this book. However, if you can get it from the library, that's probably more than enough, because you won't need to refer back to it, or want to sit and read it over and over.