Original sentence: Sprague de Camp, Lovecraft was horrified by reports of anti-Semitic violence in Germany (prior to World War II, which Lovecraft did not live to see), suggesting that Lovecraft was opposed to violent extermination of those he regarded as "inferiors"
Edited sentence: Sprague de Camp, Lovecraft was horrified by reports of anti-Semitic violence in Germany (prior to World War II, which Lovecraft did not live to see), suggesting that Lovecraft, although deeply racist himself, was strictly opposed to violent extermination of those he regarded as "inferiors"