Complex sentence: Schueller's daughter, Liliane Bettencourt, is the widow of André Bettencourt with whom she had one daughter, Françoise Meyers, a member of L'Oréal's board of directors.
Split into simpler sentences: Schueller's daughter, Liliane Bettencourt, is the widow of André Bettencourt. Together, they have one daughter, Françoise Meyers, who is a member of L'Oréal's board of directors.