Complex sentence: The Savanna Pastoral Neolithic (formerly known as the Stone Bowl Culture) is a collection of ancient societies that appeared in the Great Lakes region in East Africa, whose "Hamitic" makers are believed to have arrived from the Horn region sometime during the Neolithic period.
Split into simpler sentences: The Savanna Pastoral Neolithic (formerly known as the Stone Bowl Culture) is a collection of ancient societies that appeared in the Great Lakes region in East Africa. Their "Hamitic" ancestors are believed to have arrived from the Horn region sometime during the Neolithic period.