Parse this person name:

Marc Legros, 1821-1879, flourished 1845-1856
user
first_name: Marc
last_name: Legros
middle_names: []
temporal:
- start: 1821
  end: 1879
  type: life_span
- start: 1845
  end: 1856
  type: flourished
titles: []
extra_info: []
assistant