"Thereof" is another (more formal) way of saying "of it".
While you CAN'T say: "I'm sick thereof"
You CAN say: "I don't want to discuss this issue or anything related thereof".
not a perfect example, but you get the gist of it.
(if you were wondering how to use the word "gist", the sentence above is a perfect example).
The effect thereof was resoundingly eternal.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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You can use a period to create a clear and concise separation between independent clauses or to end a sentence. This can help to prevent run-on sentences and make the meaning of each sentence clearer for the reader.