Parse this person name:

Leon Demmendaal (1938-2010, flourished 1963-1974)
user
first_name: Leon
last_name: Demmendaal
middle_names: []
temporal:
- start: 1938
  end: 2010
  type: life_span
- start: 1963
  end: 1974
  type: flourished
titles: []
extra_info: []
assistant