Complex sentence: After finishing "First Impressions", she returned to "Elinor and Marianne" from November 1797 to mid- 1798, revising it heavily, replacing the epistolary format with third-person narration and producing something close to "Sense and Sensibility".
Split into simpler sentences: After finishing "First Impressions", she returned to "Elinor and Marianne" from November 1797 to mid- 1798. Austen revised it heavily, replacing the epistolary format with third-person narration and producing something close to "Sense and Sensibility".