Complex sentence: He lingered at Chicago seven more years as a graduate student in English literature, not showing much interest in his studies, but producing in 1910 his first book, "Maroon Tales", a collection of short stories about university life.
Split into simpler sentences: He lingered at Chicago seven more years as a graduate student in English literature. He did not show much interest in his studies, but in 1910 produced his first book, "Maroon Tales", a collection of short stories about university life.