Parse this person name:

Gregory Stewart, 1891-1954, flourished 1921-1931
user
first_name: Gregory
last_name: Stewart
middle_names: []
temporal:
- start: 1891
  end: 1954
  type: life_span
- start: 1921
  end: 1931
  type: flourished
titles: []
extra_info: []
assistant