This sentence has five words. Here are five more words. Five-word sentences are fine. But several together become monotonous. Listen to what is happening. The writing is getting boring. The sound of it drones. It’s like a stuck record. The ear demands some variety. Now listen. I vary the sentence length, and I create music. Music. The writing sings. It has a pleasant rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length. And sometimes, when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals–sounds that say listen to this, it is important.
I just found this through StumbleUpon.com (definitely a website you should check out if you have not already). I think it is a compelling writing sample that perfectly captures the importance of sentence and paragraph structure.
Here is the link to the page: http://www.robmacdougall.org/blog/2010/09/this-sentence-has-five-words/