The expanded BR tag will drop the text to the base of the image and begin rendering. With floating images (refer to image alignment) the (break) BR tag has to be expanded. If you wish to stop filling the space next to an aligned image and start on the next line underneath the image, then a normal line break will not work - it will just break the line to the current margin alongside the image. A new paragraph will also continue wrapping the text alongside the image.
However, this sentence should be rendered below the both images since it follows a BR tag that has CLEAR=ALL assigned.