Complex sentence: Barricade Books publishes The Anarchist Cookbook, by William Powell, the book, which included instructions on making bombs and homemade silencers for pistols, was first released in 1970 at the height of antiwar and anti-establishment protests.
Split into simpler sentences: Barricade Books publishes The Anarchist Cookbook, by William Powell. The book, which included instructions on making bombs and homemade silencers for pistols, was first released in 1970 at the height of antiwar and anti-establishment protests.