Complex sentence: His first wife was Mary Edith Scott (Mabel), who married him in 1890, tried to divorce him (and lost) in 1891, and sued for restoration of conjugal rights in 1894.
Split into simpler sentences: His first wife was Mary Edith Scott (Mabel). They married in 1890, and Mabel tried to divorce him (and lost) in 1891; she sued for restoration of conjugal rights in 1894.