Complex sentence: He had a stormy professional relationship with actress Joan Crawford (Crawford referred to Kendall as "Fang" until her death in 1977), who gained a seat on the board of directors of Pepsi Cola Company after the death of her husband Alfred Steele.
Split into simpler sentences: He had a stormy professional relationship with actress Joan Crawford, who referred to Kendall as "Fang" until her death in 1977. Crawford gained a seat on the board of directors of Pepsi Cola Company after the death of her husband Alfred Steele.