Complex sentence: Though it is still a part of the Nile basin, it is ecologically and culturally part of Central Africa, its' peoples and customs more similar to those of eastern D.R. Congo than the rest of Uganda despite being politically in East Africa.
Split into simpler sentences: Though it is still a part of the Nile basin, it is ecologically and culturally part of Central Africa. It's people and customs are more similar to those of eastern DRC than the rest of Uganda, despite being politically in East Africa.