4. Laws made under Articles 2 and 3 to provide for the amendment of the First and the Fourth Schedules and supplemental, incidental and consequential matters.-
(1) Any law referred to in Article 2 or Article 3 shall contain such provisions for the amendment of the First Schedule and the Fourth Schedule as may be necessary to give effect to the provisions of the law and may also contain such supplemental, incidental and consequential provisions (including provisions as to representation in Parliament and in the Legislature or Legislatures of the State or States affected by such law) as Parliament may deem necessary.
(2) No such law as aforesaid shall be deemed to be an amendment of this Constitution for the purposes of Article 368.
In simple terms this article specifies that the laws provided in article 2 and 3, admission/establishment of new states and alternation of names, areas and boundaries etc. of established states, are not to be considered amendments of the Constitution under article 368, which means these can be passed without resorting to any special procedure and by simple majority.
*So formation of new state is not called as constitutional amendment and also it can be passed by simple majority.