Parse this person name:

Sam Heijmans, 1941-1981, flourished 1968-1976
user
first_name: Sam
last_name: Heijmans
middle_names: []
temporal:
- start: 1941
  end: 1981
  type: life_span
- start: 1968
  end: 1976
  type: flourished
titles: []
extra_info: []
assistant