Complex sentence: In the first week of the conflict, Somali armed forces took southern and central Ogaden and for most of the war, the Somali army scored continuous victories on the Ethiopian army and followed them as far as Sidamo.
Split into simpler sentences: In the first week of the conflict, Somali armed forces seized the southern and central parts of the Ogaden. For most of the war, the Somali army scored continuous victories on the Ethiopian army, following it as far as Sidamo.