Complex sentence: The Harriet Beecher Stowe House was once the residence of Harriet Beecher Stowe (1811-1896), she was the influential antislavery author who wrote "Uncle Tom's Cabin".
Split into simpler sentences: The Harriet Beecher Stowe House was once the residence of Harriet Beecher Stowe (1811-1896). Harriet was the influential antislavery author who wrote "Uncle Tom's Cabin".