Simplify the following text for a Grade 7 native English-speaking person.
Original: The Vatican 's sources also speak of similar figures , that is , for an example , of 350,000 Serbs slaughtered by the end of 1942 ( Eugen Tisserant ) and `` over 500,000 people '' in all ( Godfried Danneels . )
Simplified: The Vatican 's sources also speak of similar figures , E.g. of 350,000 Serbs slaughtered by the end of 1942 ( Eugen Tisserant ) and `` over 500,000 people '' at all ( Godfried Danneels . ) )