Complex sentence: A slightly amended version was adopted by the United Nations in 1946, and on November 20,1959 the General Assembly of the United Nations adopted a much expanded version as its own Declaration of the Rights of the Child.
Split into simpler sentences: A slightly amended version was adopted by the United Nations in 1946. On 20 November 1959 the United Nations General Assembly adopted a much expanded version as its own Declaration of the Rights of the Child.