Parse this person name:

Richard Mills, 1912-1953, flourished 1939-1948
user
first_name: Richard
last_name: Mills
middle_names: []
temporal:
- start: 1912
  end: 1953
  type: life_span
- start: 1939
  end: 1948
  type: flourished
titles: []
extra_info: []
assistant