Improve this sentence for readability: The First Convention (1964-1969) The first association agreement between the EEC and the 18 African ex-colonies that had recently gained independence, was signed in Yaoundé on 20 July 1963 and entered into force on 1 June 1964.
The First Convention (1964–1969) The first association agreement between the EEC and the 18 African ex-colonies that had recently gained independence, was signed in Yaoundé on 20 July 1963 and entered into force on 1 June 1964.