Complex sentence: There is no agreement on when and where this "Urheimat" existed, though Proto-Afroasiatic is believed to have originated in the area between the Eastern Sahara and the Horn of Africa, including Egypt, Ethiopia and Sudan.
Split into simpler sentences: There is no agreement on when and where this "Urheimat" existed. One theory propose Proto-Afroasiatic to have originated either in the area between the Eastern Sahara and the Horn of Africa, including Egypt, Ethiopia and Sudan.