Parse this person name:

Alec Roberts, 1920-1999, flourished 1950-1969
user
first_name: Alec
last_name: Roberts
middle_names: []
temporal:
- start: 1920
  end: 1999
  type: life_span
- start: 1950
  end: 1969
  type: flourished
titles: []
extra_info: []
assistant