Parse this person name:

Stephen Welch, 1818-1860, flourished 1836-1855
user
first_name: Stephen
last_name: Welch
middle_names: []
temporal:
- start: 1818
  end: 1860
  type: life_span
- start: 1836
  end: 1855
  type: flourished
titles: []
extra_info: []
assistant