$ python
Python 3.9.16 | packaged by conda-forge | (main, Feb  1 2023, 21:38:11) 
[Clang 14.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import nltk
>>> s = "It's a Thursday. We are in class. It is sunny."
>>> nltk.sent_tokenize(s)
["It's a Thursday.", 'We are in class.', 'It is sunny.']
>>>