Original sentence: Of the estimated 8.8 million Jews living in Europe at the beginning of World War II, the majority of whom were Ashkenazi, about 6 million — more than two-thirds — were systematically murdered in the Holocaust
Edited sentence: Of the estimated 8.8 million Jews living in Europe at the beginning of World War II, the majority of whom were Ashkenazi, about 6 million — more than two-thirds — were killed in the Holocaust