Simplify the following text for a Grade 4 native English-speaking person.
Original: Wernher von Braun was born in Wirsitz ( Wyrzysk ) , Province of Posen , then a part of the German Empire , and was the second of three sons .
Simplified: Von Braun was born in Wirsitz ( today : Wyrzysk ) in Poland on 23 March 1912 .