Complex sentence: It was named after Sir Walter Scott's novel Waverley, first novel in a series known as the Waverley Novels, among the most popular and widely read novels in all of Europe in the 19th century.
Split into simpler sentences: It was named after Sir Walter Scott's novel Waverley, first novel in a series known as the Waverley Novels. They were among the most popular and widely read novels in all of Europe in the 19th century.