It did break into at least x2 pieces (maybe more). You can see what looks like a nacelle dropping off to the right of frame (low in the main shot of the ship hitting the waterfront).
The nacelle drops fairly heavily in something of a slide - although it's not prominant, when compared to the saucer section plowing into skyline.
My hope is that it is salvaged and that we see it again in the next movie...
EDIT: as per Locutus' image above