Complex sentence: Volume one, number one of the newspaper contained only one page and the editorial titled "Ourselves" promised subsequent issues of four pages to be published weekly until 14 August 1880 after which the newspaper would become a tri-weekly publication.
Split into simpler sentences: Volume one, number one of the newspaper is comprised of only one page with an editorial titled "Ourselves". The editorial promised subsequent issues of four pages to be published weekly until 14 August 1880 after which the newspaper would then become a tri-weekly publication.