Complex sentence: Her only child, Elizabeth Pleasance "Betty" Cummings, was born to the first marriage, and in 1938 married Dr Herbert Beaton Giles (died 1953), son of Rev. Charles Giles, of Aberdeen.
Split into simpler sentences: Her only child, Elizabeth Pleasance "Betty" Cummings, was born of the first marriage. In 1938 she married Dr Herbert Beaton Giles (died 1953), son of Rev. Charles Giles, of Aberdeen.