Original sentence: Earlier in his life, when he began promoting Protestantism, Luther communicated with converted-Jews who had become Christians and non-converted Jews on largely friendly terms.Scholars on Luther such as David M.Whitford and Wladyslaw Roczniak note that the context of Luther's antisemitism needs to be understood; Luther was initially a defender of Jews against Christian violence but by the end of his life had become visciously antisemitic; Luther's antisemitism is believed to have been caused by his frustration at Jews' resistance to convert to Christianity
Edited sentence: Wladyslaw Roczniak has noted that the context of Luther's antisemitism needs to be understood; Luther was initially a defender of Jews against Christian violence but by the end of his life had become visciously antisemitic; Luther's antisemitism is believed to have been caused by his frustration at Jews' resistance to convert to Christianity