SECTION 1. Reapportioning of the First Legislative District. - The First Legislative District of the Province South Cotabato is hereby reapportioned in order to create the Lone Legislative District of General Santos City to commence in the next national and local elections after the effectivity of this Act. The Legislative District of the Province shall now be composed of the following:
(a) First Legislative District:
(1) Polomolok
(2) Tampakan
(3) Tupi
(b) Second Legislative District:
(1) Koronadal City
(2) Banga
(3) Lake Sebu
(4) Norala
(5) Santo Niño
(6) Surallah
(7) Tantangan
(8) T'Boli
(c) Third Legislative District:
(1) General Santos City.