Complex sentence: Unusually for the dissident movement at the time, the organization tried to appeal to the international community: speaking on behalf of the victims of political repression in the Soviet Union the Group wrote to the UN Commission on Human Rights.
Split into simpler sentences: Unusually for the dissident movement at the time, the organization tried to appeal to the international community. Speaking on behalf of the victims of political repression in the Soviet Union the Group wrote to the UN Commission on Human Rights.