Complex sentence: The AAoI claims that the 80% success rate to the technical assessment is false and that the percentage is nearer to 50% and that less of a dozen of practitioners (out of hundreds of potential applicants) have applied for the Technical Assessment.
Split into simpler sentences: The AAoI claims that the 80% success rate to the technical assessment is false and that the percentage is nearer to 50%. AAoI declared that less of a dozen of practitioners (out of hundreds of potential applicants) have applied for the Technical Assessment.