Complex sentence: At the governess' suggestion Mrs. Grose takes Flora away to her uncle, leaving the governess with Miles, who that night at last talks to her about his expulsion; the ghost of Quint appears to the governess at the window.
Split into simpler sentences: At the governess'suggestion Mrs. Grose takes Flora away to her uncle, leaving the governess with Miles. That night, they are finally talking of Miles' expulsion when the ghost of Quint appears to the governess at the window.