Complex sentence: Although the boy's nursemaid, Elizabeth, was initially arrested, she was soon released and the suspicions of Detective Inspector Jack Whicher of Scotland Yard moved to the boy's sixteen-year-old half-sister, Constance.
Split into simpler sentences: Although the boy's nursemaid, Elizabeth, was initially arrested. Elizabeth was released when the suspicions of Detective Inspector Jack Whicher of Scotland Yard moved to the boy's sixteen-year-old half-sister, Constance.