Complex sentence: The book garnered many enthusiastic professional reviews and won the prestigious Bancroft Prize in 2001; but because the book's thesis bore upon ongoing political controversies about gun control and the Second Amendment to the United States Constitution, gun rights advocates immediately attacked it.
Split into simpler sentences: The book garnered many enthusiastic professional reviews and won the prestigious Bancroft Prize in 2001. Because the book's thesis bore upon ongoing political controversies about gun control and the Second Amendment to the United States Constitution, gun rights advocates immediately attacked it.