Complex sentence: Human Rights are specifically referred to in the UN Charter sparringly, reflecting an unwillingness on the part of Allied powers to codify an International Bill of Rights fearing that colonial interests may be negatively affected.
Split into simpler sentences: Human Rights are specifically referred to in the UN Charter only sparringly. It reflects at that time an unwillingness on the part of the Allied powers to codify an International Bill of Rights fearing that colonial interests may be negatively affected.