Complex sentence: The sooner an examinee reacts to a developing hazard, the more points are scored, from five down to one, with no score if the examinee reacts too late, thus the maximum possible score is 75 (100 for lorry and bus tests).
Split into simpler sentences: The sooner an examinee reacts to a developing hazard, the more points are scored, from five down to one, with no score if the examinee reacts too late. Thus the maximum possible score is 75 (100 for lorry and bus tests).