Complex sentence: Jensen and Rushton consider that it may account for as little as 20% of the gap W.hie Hunt considers this a vast overstatement he nonetheless considers it likely that some portion of the gap will eventually be shown to be caused by genetic factors.
Split into simpler sentences: Jensen and Rushton consider that it may account for as little as 20% of the gap. Meanwhile, while Hunt considers this a vast overstatement he nonetheless considers it likely that some portion of the gap will eventually be shown to be caused by genetic factors.