Original sentence: Criticism of Muhammad has persisted since ancient times, where he was frequently demonized in European Christian polemic.In modern times, Muhammad has been criticized for a number of things including his marriages, military expeditions and ownership of slaves
Edited sentence: Criticism of Muhammad has existed since ancient times, when he was frequently demonized in European polemic.In modern times, Muhammad has been criticized for a number of things including his sexual activities, military expeditions, and involvement in slavery