Hi there! I'd be happy to help you with this in a class. What a great piece of writing that is--one of my favorites. If you want to work on your own though, think: beginning, middle, end. Break it down for yourself that way and decide how many sentences you will need to represent the beginning, how many for the middle, and how many for the end. Only 5 sentences breaks down nicely if you look at the assignment that way. All the best!