I interpreted this phrase as: nexus (between) peace communication / and development. I translated 'peace communication' by 'médiation' and did away with 'nexus' because I thought translating it wouldn't add that much information and the source phrase already being an abbreviation... I favored brevity. If you absolutely want to translate 'nexus', then It might be best to do away with 'communication' this time, so I'd suggest something like: 'Interdépendance Paix/Développement'.

Of course I might be misinterpreting, this might mean nexus (between) peace / communication / and development, but the data I've found seems to indicate that in the context of Africa, peace and communication are not two separate concepts in this instance.