Below are several links and pieces that help to explain the current situation in South Sudan by reviewing the violence that has occurred across the state (and in particular Jonglei) since Independence.
What explains the violence? African Arguments Piece
The UN is the Solution…. African Arguments Piece
Violence in Jonglei- HSBA
Yau Yau Rebellion – Small Arms Survey
Militias in South Sudan- HSBA
Cultural Explanations for violence in Jonglei- PRIO