Simplify the following text for a Grade 10 native English-speaking person.
Original: WÃ 1\/4 rttemberg-Hohenzollern consisted of the southern half of the former state of WÃ 1\/4 rttemberg and the Prussian administrative region of Hohenzollern .
Simplified: After World War II the part of the Free Peoples ' State of WÃ 1\/4 rttemberg and the old Principality of Hohenzollern were joined to make WÃ 1\/4 rttemberg-Hohenzollern .