147. An offender who receives an additional sentence to be served consecutively to a portion of the sentence of imprisonment currently being served in accordance with section 33 is eligible for conditional release only on the latest of the following dates:(1) the date on which the offender has served a third of the sentence being served at the time the additional sentence is imposed;
(2) the date on which the offender has served a third of the additional sentence, determined from the date the additional sentence is imposed;
(3) the date on which the offender has served a third of the sentence of imprisonment determined in accordance with section 33.
The parole board must, in such a case, examine the record of the person on the basis of the new date of eligibility.