Simplify the following text for a Grade 5 native English-speaking person.
Original: Willy Brandt was born Herbert Ernst Karl Frahm in the Free City of LÃ 1\/4 beck ( German Empire ) to Martha Frahm , an unwed mother who worked as a cashier for a department store . His father was an accountant from Hamburg named John MÃ ller , whom Brandt never met .
Simplified: He was born as son of Martha Frahm and John MÃ ller in 1913 in LÃ 1\/4 beck .