The term of the Class I member shall correspond with his official tenure. The terms of the Class II and Class III members shall be for one year or terminate at the completion of their respective terms of office, whichever occurs first. The term of a Class IV member who is also a member of the Board of Education shall terminate whenever he is no longer a member of the Board of Education or at the completion of his Class IV term, whichever occurs first. The terms of all Class IV members first appointed pursuant to this chapter shall be so determined that, to the greatest practicable extent, the expiration of such term shall be distributed evenly over the first four years after their appointments, as determined by resolution of the Township Committee; provided, however, that no initial term of any Class IV member shall exceed four years and further provided that nothing herein shall affect the term of any present member of the Planning Board, all of whom shall continue in office until the completion of the terms for which they were appointed. Thereafter, all Class IV members shall be appointed for terms of four years, except as otherwise herein provided. All terms shall run from January 1 of the year in which the appointment was made.