Complex sentence: Badiou suggests that such butchery has instilled doubt and nostalgia for historical moments of the past and states that the 20th century sought to fulfill the promises of the 19th century, including Marx's concept of revolution.
Split into simpler sentences: Badiou suggests that such butchery has instilled doubt and nostalgia for historical moments of the past. Badiou states that the 20th century sought to fulfill the promises of the 19th century, including Marx's concept of revolution.