Angolan Civil War seems less complex
MPLA has a typical Soviet Marxist Leninist urban working class approach, not being sectarian regarding tribe or ethnicity, and so thus supported by USSR, Warsaw Pact and Cuba
UNITA has support from majority peasant Ovimbundu and supported by Maoist China early on but mostly Amerikkka and Apartheid South Africa, and I'd argue they ceased to be Maoist by then and purely reactionary.
But tell me about Horn of Africa and it's a huge fuck up of Communists fighting each other over ethnicity
DERG VS SOMALI VS Eritrea VS Tigray
But ah well, to destroy a deviationist Communist party is no loss, to keep them is not gain, even if they're under the ML banner