The present civil war involves military leaders, basically Arab Zaghawa cattle and camel tribals of western Sudan who made their bones in Darfur, against the riverine Nile Arabs who with Egyptian blessing, and with the exception of the Mahdi interregnum, have ruled the Sudan for centuries and impoverished the nation. It is to be greatly hoped that they will destroy each other.
I read this time-line of events in Sudan at another site:
8.24.22- US appoints ambassador to Sudan (following a 25 year lapse)
9.28.22- US ambassador warns Sudan against finalizing Russian naval base deal
11.11.22- Blinken urges Sudan to consider “US support for the rapid formation of a civilian-led transitional government”
12.5.22- UN brokers Framework Agreement between Sudan’s military leaders and leading pro-democracy parties
12.7.22- Blinken threatens travel ban for Sudanese who threaten Framework Agreement deal
2.12.23- Sudan confirms deal for Russian naval base
2.16.23- Biden sends $288m in humanitarian aid
3.9.23- Victoria Nuland visits Sudan to “discuss democracy”
4.8.23- conflict escalates between Sudanese Armed Forces and paramilitary groups
4.22.23- US evacuates Sudan