Complex sentence: Each successive version has renormed the test to compensate for the Flynn effect, refined questions to make them less biased against minorities and females, and updated materials to make them more useful in the administration of the test.
Split into simpler sentences: Each successive version has re-normed the test to compensate for the Flynn effect. Additional updates and refinements include changes to the questions to make them less biased against minorities and females, and updated materials to make them more useful in the administration of the test.