Original: Following the ratification on 26 April 1964 of the Articles of Union between Tanganyika and Zanzibar, the two states merged to form the United Republic of Tanganyika and Zanzibar, which continued as a single member; it changed its name to the United Republic of Tanzania on 1 November 1964.
Simplified: After the ratification on 26 April 1964 of Articles of Union between Tanganyika and Zanzibar, the United Republic of Tanganyika and Zanzibar continued as a single Member, changing its name to the United Republic of Tanzania on 1 November 1964.