"Which is sad to hear, he died."
"Which annoyed the dog, the cat was allowed on the bed."
No. Don't begin a sentence with a relative which. He died, which is sad news.
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No. Don't begin a sentence with a relative which.
He died, which is sad news.
The cat was allowed on the bed, which annoyed the dog.
CB
When you begin a sentence with the noun modifier "which," you are asking a question.
Which cat annoyed the dog, the Persian or the Siamese?
You can begin a sentence with "what" as a pronoun, the subject in a content clause:
[What annoyed the dog] was that the cat was allowed on the bed.
The content clause is the subject of the main clause.