Parse this person name:

Sem Berends (1411-1455, flourished 1440-1450)
user
first_name: Sem
last_name: Berends
middle_names: []
temporal:
- start: 1411
  end: 1455
  type: life_span
- start: 1440
  end: 1450
  type: flourished
titles: []
extra_info: []
assistant