The Council on Foreign Relations is a non-partisan think-tank devoted to studying the global situation. Its reporting on Congo is very helpful:
For nearly two decades, the eastern provinces of the Democratic Republic of the Congo (DRC) have been the epicenter of the deadliest conflict since World War II. Part of a vast country straddling the heart of central Africa, the eastern Congo continues to defy efforts at pacification. As the conflict has morphed from a regional war to a series of tenacious local insurgencies, the civilians caught in the middle have paid the steepest price.
Read more at www.cfr.org.
For a briefer overview, the Enough Project provides a good summary and offers ways to take action:
Over 5.4 million dead. Over 2 million displaced. Congo is home to the deadliest conflict since World War II. … The conflict in Congo is notorious for serious violations of human rights, including violence against women and the use of child soldiers.
Read more at www.enoughproject.org.