Parse this person name:

Lex van der Meer, 1909-1964, flourished 1938-1959
user
first_name: Lex
last_name: van der Meer
middle_names: []
temporal:
- start: 1909
  end: 1964
  type: life_span
- start: 1938
  end: 1959
  type: flourished
titles: []
extra_info: []
assistant