Parse this person name:

Maarten Ernst, 1284-1349, flourished 1308-1318
user
first_name: Maarten
last_name: Ernst
middle_names: []
temporal:
- start: 1284
  end: 1349
  type: life_span
- start: 1308
  end: 1318
  type: flourished
titles: []
extra_info: []
assistant