The sentence 'The doctor worked an overnight shift, but the nurse focused on several patients per hour' is an example of a compound sentence.
Compound sentences have two or more independent clauses. In the sentence provided, 'The doctor worked an overnight shift, but the nurse focused on several patients per hour,' there are two independent clauses ('The doctor worked an overnight shift' and 'the nurse focused on several patients per hour'), making it a compound sentence.
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