Complex sentence: These issues have been addressed by a rapidly increasing number of international institutions including, in 2015, the Council of Europe, the United Nations Office of the United Nations High Commissioner for Human Rights and the World Health Organization.
Split into simpler sentences: These issues have been addressed by a rapidly increasing number of international institutions. In 2015 they included the Council of Europe, the United Nations Office of the United Nations High Commissioner for Human Rights and the World Health Organization.