Complex sentence: In 41 villages, he writes, the inhabitants were expelled by the IDF; in another 90, the inhabitants fled because of attacks on other villages; and in six, the inhabitants left under instructions from local Palestinian authorities.
Split into simpler sentences: In 41 villages, he writes that the inhabitants were expelled by military forces; in another 90 villages, that the inhabitants panicked because of attacks on other villages, and fled. In six villages, he writes, the inhabitants left under instructions from local Palestinian authorities.