Parse this person name:

Sean Thomas, 1927-1991, flourished 1957-1986
user
first_name: Sean
last_name: Thomas
middle_names: []
temporal:
- start: 1927
  end: 1991
  type: life_span
- start: 1957
  end: 1986
  type: flourished
titles: []
extra_info: []
assistant