Parse this person name:

Kreszenz S. (Kreszenz Sylvester) Tschentscher, 1450-1492
user
first_name: Kreszenz
last_name: Tschentscher
middle_names:
- Sylvester
temporal:
- start: 1450
  end: 1492
  type: life_span
titles: []
extra_info: []
assistant