Original: Husserl taught philosophy, as a Privatdozent at Halle from 1887, then as professor, first at Göttingen from 1901, then at Freiburg im Breisgau from 1916 until his 1928 retirement.
Simplified: Then Husserl taught philosophy, as a Privatdozent at Halle from 1887, and as a professor: first at Göttingen from 1901, then at Freiburg im Breisgau from 1916 until his 1928 retirement.