Complex sentence: John Kennedy Toole's first novel, The Neon Bible, was written at the age of only 16, its main appeal is as an interesting look at a writer who would later reach great heights with A Confederacy of Dunces.
Split into simpler sentences: John Kennedy Toole's first novel, The Neon Bible, was written at the age of only 16. Its main appeal is as an interesting look at a writer who would later reach great heights with A Confederacy of Dunces.