Parse this person name:

Lukas van der Stael-Mercks (1839-1912, flourished 1859-1889)
user
first_name: Lukas
last_name: van der Stael-Mercks
middle_names: []
temporal:
- start: 1839
  end: 1912
  type: life_span
- start: 1859
  end: 1889
  type: flourished
titles: []
extra_info: []
assistant