Complex sentence: Alexander was able to reach a large group of people with "The New Jim Crow", all of whom aim to work together to to bring an end to all forms of hate and discrimination directed against people of color.
Split into simpler sentences: Alexander was able to reach a large group of people with her book, "The New Jim Crow". They work together to make a difference and stop the discrimination as well as to bring a final end to all forms of hate brought to people of color.