Don't keep re-reading the same phrases.
Poor readers habitually read and re-read the same phrase over and over again. This habit of making "regressions" doubles or triples reading time and often does not result in better comprehension. A single careful, attentive reading may not be enough for full comprehension, but is often more effective than constant regressions in the middle of a reading. It is best to work on paying closer attention the first time through. Do a preview first before the careful reading and try the tips I mentioned above. You'll remember better without the rereading.