Complex sentence: On the eighth night, the old man awakens after the narrator's hand slips and makes a noise, interrupting the assassin's nightly ritual, but he does not draw back and, after some time, decides to open his lantern.
Split into simpler sentences: On the eighth night, the old man awakens after the narrator's hand slips and makes a noise, interrupting the narrator's nightly ritual. But the narrator does not draw back and, after some time, decides to open his lantern.