Which of these is correct?
- Before he had come to the factory, Tom was studying at the University of London.
- Before he came to the factory, Tom had studied at the University of London.
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To my mind, both the sentences have different meanings. The second sentence is correct because the activity of studying was complete, and hence the past perfect tense. The first sentence leaves the meaning of the activity incomplete. We cannot use past perfect for the activity which takes after something has already come to an end.