Complex sentence: Canning disappeared on 1 January 1753 and was absent for almost a month, before returning to her mother's home in Aldermanbury in the City of London, emaciated and in a "deplorable condition".
Split into simpler sentences: Canning disappeared on 1 January 1753, and was missing for almost a month. She returned to her mother's home in Aldermanbury in the City of London, emaciated and in a "deplorable condition".