This provides for emphasis and punctuation. Often it adds an element of drama to the story and spices up the writing. Direct sentences Simpler is always better. Find a way to construct each sentence in using the fewest and simplest words while imparting as much information as possible. Use interesting images and words, but do not be flowery.
Simple words can be just as effective as long, flowery ones.
In fact, simple words are usually more effective. The huge assassin plunged a knife in the gang member's stomach and fled down the dark alley, chugging like a freight train.