Parse this person name:

Gregory Butler, 1903-1964, flourished 1929-1951
user
first_name: Gregory
last_name: Butler
middle_names: []
temporal:
- start: 1903
  end: 1964
  type: life_span
- start: 1929
  end: 1951
  type: flourished
titles: []
extra_info: []
assistant