Complex sentence: At the same time the Eritrean-Ethiopian conflict was happening, both the war and the prejudice acts of the Selassie and other Ethiopian officials triggred the resettling of tens and thousands of Tigres in Sudan.
Split into simpler sentences: At the same time the Eritrean-Ethiopian conflict was happening. Both the war and the continuous persecutions carried out by Selassie and other Ethiopian officials triggred the resettling of tens and thousands of Tigres in Sudan.