Complex sentence: After the first treaty expired, a new one was signed on 29 July 1969 and entered into force on 1 January 1971, with Madagascar and Mauritius becoming the 19th African state to take part in the convention.
Split into simpler sentences: After the first treaty expired, a new one was signed on 29 July 1969. It later entered into force on 1 January 1971, with Madagascar and Mauritius becoming the 19th African state to take part in the convention.