Complex sentence: In 2013 she was invited to talk about her work, "Horn of Africa Development Initiative", at the Geneva Peace Talks on 20 September 2013 that was organised by the United Nations band other groups for the International Day of Peace.
Split into simpler sentences: In 2013 she was invited to talk about her work with the Horn of Africa Development Initiative at the Geneva Peace Talks on 20 September 2013. The talks were organised by the United Nations and other groups for the International Day of Peace.