Simplify the following text for a Grade 5 native English-speaking person.
Original: His mother , Regina Wender Fischer , was an American citizen of Polish Jewish descent , born in Switzerland and raised in St. Louis , Missouri .
Simplified: His mother , Regina Wender Fischer , was a Polish-Jewish American citizen . Born in Switzerland , she grew up in St. Louis , Missouri , and later became a teacher , a nurse , and a doctor .