Simplify the following text for a Grade 10 native English-speaking person.
Original: Bonham Carter 's maternal grandfather , Spanish diplomat Eduardo Propper de CallejÃ n , saved thousands of Jews from the Holocaust during World War II , for which he was recognized as Righteous among the Nations ( his own father had been Jewish ) .
Simplified: Helena Bonham Carter 's maternal grandfather , Eduardo Propper de CallejÃ n , was half Spanish and half Jewish .