Original sentence: In 1800 he served briefly in an all-volunteer military unit, the Jäger Freikorps, then became apprenticed to  a piano maker named Jakob Schelkle, who worked in Währing, a suburb of Vienna
Edited sentence: In 1800 he served briefly in an all-volunteer military unit, the Jäger Freikorps, then became apprenticed to  a piano maker named Jakob Schelkle, who worked in Währing, then a suburb of Vienna