Complex sentence: The portion of the valley of the White Nile between the villages of Muomo and Asalaya was unfavourable for agriculture; however, the northern savannah provided an abundance of game, fish and honey.
Split into simpler sentences: The portion of the valley of the White Nile between the villages of Muomo and Asalaya wasn't favourable for agriculture. However the northern savannah provided an abundance of food such as game, fish and honey.