Parse this person name:

Aleksej Roskoth (1897-1956, flourished 1912-1940)
user
first_name: Aleksej
last_name: Roskoth
middle_names: []
temporal:
- start: 1897
  end: 1956
  type: life_span
- start: 1912
  end: 1940
  type: flourished
titles: []
extra_info: []
assistant