Complex sentence: Soyinka's mother, Grace Eniola Soyinka, whom he dubbed the "Wild Christian", owned a shop in the nearby market and was a political activist within the women's movement in the local community.
Split into simpler sentences: Soyinka's mother, Grace Eniola Soyinka (whom he dubbed the "Wild Christian"), owned a shop in the nearby market. She was a political activist within the women's movement in the local community.