SPLA divided into 3

In August 1991, there was still fighting going on between the north and the south but the SPLA was fighting from within. The group was not agreeing on various issues and therefore split into three different factions of the rebel army. These factions were the Nasir led by Colonel Garang, the second rebel faction was led by William Nyuon Bany, and the third was formed by Kerubino Kwanyin Bol. The coalition of these groups was called SPLA United, but the groups fought occasionally and this lost them much of their credibility in the West.Although there are many different groups controlling (or fighting for control) in many different areas of Sudan, there are many places without any form of government. Sudan is simply too large for Khartoum's government or the rebel forces to control it all. (The U.S. not only has Washington, D.C., it has state governments that help control the country.)

Sources:
http://en.wikipedia.org/wiki/Sudan_People's_Liberation_Army
http://www.splmtoday.com/