Complex sentence: Although slavery was abolished in the 1940s, the effects of Ethiopia's longstanding peculiar institution lingered.Mengistu's rise to prominence was hailed by the southern Shanqella groups as a personal victory, with one of their own having made good.
Split into simpler sentences: Although slavery was abolished in the 1940s, the effects of Ethiopia's longstanding peculiar institution lingered. By contrast, Mengistu's rise to prominence was hailed by the southern Shanqella groups as a personal victory, with one of their own having made good.