All amendments proposed by the general assembly or by the initiative shall be submitted to the electors for their approval or rejection by official ballot title as may be provided by law, on a separate ballot without party designation, at the next general election, or at a special election called by the governor prior thereto, at which he may submit any of the amendments. No such proposed amendment shall contain more than one amended and revised article of this constitution, or one new article which shall not contain more than one subject and matters properly connected therewith. If possible, each proposed amendment shall be published once a week for two consecutive weeks in two newspapers of different political faith in each county, the last publication to be not more than thirty nor less than fifteen days next preceding the election. If there be but one newspaper in any county, publication for four consecutive weeks shall be made. If a majority of the votes cast thereon is in favor of any amendment, the same shall take effect at the end of thirty days after the election. More than one amendment at the same election shall be so submitted as to enable the electors to vote on each amendment separately.