Complex sentence: The book was highly regarded for its innovative research on sociological concepts and census data; in 1941, the book won the prestigious Dunning Prize from the American Historical Association as outstanding historical work published by a young scholar.
Split into simpler sentences: The book was highly regarded for its innovative research on sociological concepts and census data. In 1941 it won the prestigious Dunning Prize from the American Historical Association as outstanding historical work published by a young scholar.