Parse this person name:

Sepp Groen-Jansen, 1817-1876, flourished 1835-1865
user
first_name: Sepp
last_name: Groen-Jansen
middle_names: []
temporal:
- start: 1817
  end: 1876
  type: life_span
- start: 1835
  end: 1865
  type: flourished
titles: []
extra_info: []
assistant