Parse this person name:

Leonhard Margraf, 1807-1857, flourished 1830-1848
user
first_name: Leonhard
last_name: Margraf
middle_names: []
temporal:
- start: 1807
  end: 1857
  type: life_span
- start: 1830
  end: 1848
  type: flourished
titles: []
extra_info: []
assistant