Complex sentence: Her father was Saadi, from the Nyamwezi tribe from Tabora, and her mother was from the Zigua tribe from Tanga; both were born in Zanzibar to very poor families and were engaged in agricultural activities and pottery manufacture that Siti herself learned and mastered well.
Split into simpler sentences: Her father was Saadi, a person of the Nyamwezi tribe from Tabora, and her mother was a person of the Zigua tribe from Tanga, but both were born in Zanzibar. The living conditions of their families were very poor and were engaged in agricultural activities and pottery works that Siti had learned and mastered well.