Parse this person name:

Aleksej Gröttner, 1946-1996, flourished 1969-1987
user
first_name: Aleksej
last_name: Gröttner
middle_names: []
temporal:
- start: 1946
  end: 1996
  type: life_span
- start: 1969
  end: 1987
  type: flourished
titles: []
extra_info: []
assistant