Parse this person name:

Sjoerd Niermann (1318-1370, flourished 1341-1365)
user
first_name: Sjoerd
last_name: Niermann
middle_names: []
temporal:
- start: 1318
  end: 1370
  type: life_span
- start: 1341
  end: 1365
  type: flourished
titles: []
extra_info: []
assistant