Simplify the following text for a Grade 7 native English-speaking person.
Original: In 1870 , he quit his job at the Kreuzzeitung and became drama critic for the liberal Vossische Zeitung , a position he held until retirement .
Simplified: In 1870 , he quit his job at the Kreuzzeitung and became theater critic for the liberal Vossische Zeitung ( newspaper ) . This job he kept until retirement .