Parse this person name:

Stefan de Heer (1705-1770, flourished 1721-1750)
user
first_name: Stefan
last_name: de Heer
middle_names: []
temporal:
- start: 1705
  end: 1770
  type: life_span
- start: 1721
  end: 1750
  type: flourished
titles: []
extra_info: []
assistant