What factors led to the genocide in the Sudan? What factors led to the division of Sudan?

Here's a summary of what I found:

The Darfur region of Sudan is home to racially mixed tribes of settled peasants, who identify as African, and nomadic herders, who identify as Arab. The majority of people in both groups are Muslim.

In the ongoing genocide, African farmers and others in Darfur are being systematically displaced and murdered at the hands of the Janjaweed, a government-supported militia recruited from local Arab tribes. The genocide in Darfur has claimed 400,000 lives and displaced over 2,500,000 people. More than one hundred people continue to die each day; five thousand die every month.

Government neglect has left people throughout Sudan poor and voiceless and has caused conflict throughout the country. In February 2003, frustrated by poverty and neglect, two Darfurian rebel groups launched an uprising against the Khartoum government. The government responded with a scorched-earth campaign, enlisting the help of a militia of Arab nomadic tribes in the region against the innocent civilians of Darfur.

Since February 2003, the Sudanese government in Khartoum and the government-sponsored Janjaweed militia have used rape, displacement, organized starvation, threats against aid workers and mass murder. Violence, disease, and displacement continue to kill thousands of innocent Darfurians every month.