Complex sentence: That the two had a son who died in infancy was alleged by Dickens's daughter, Kate Perugini, whom Gladys Storey had interviewed before her death in 1929, and published her account in "Dickens and Daughter",.
Split into simpler sentences: That the two had a son who died in infancy was alleged by Dickens's daughter, Kate Perugini, whom Gladys Storey had interviewed before her death in 1929. Storey published her account in "Dickens and Daughter",.