Parse this person name:

Ansgar Briemer (1923-1976, flourished 1939-1959)
user
first_name: Ansgar
last_name: Briemer
middle_names: []
temporal:
- start: 1923
  end: 1976
  type: life_span
- start: 1939
  end: 1959
  type: flourished
titles: []
extra_info: []
assistant