The two factions are  
1. Soldiers loyal to Mr. Kiir (President of South Sudan) , a member of the Dinka tribe, and 
2 Rebels backing Mr. Machar (Presently Vice-President), a Nuer.

The conflict between the tribal groups are to seize the resources and Political power of South Sudan.

Recently, the civil war got reignited because of altercation between the soldiers of the warring groups.

300 Indians stuck in Juba
At least 300 Indians have been left stranded as one of Africa’s oldest civil wars reignited on July 7 in Juba, the capital of South Sudan.
Fleeing the fight between the heavily armed rival factions divided on ethnic lines, Indians have taken refuge in various locations, including the Embassy of India.