past perfect - Tense agreement: "Before he 'had come'/'came' to the factory, Tom 'was studying'/'had studied' at the university of London"

Which of the following sentences is correct?

1. 
   

   Before he had come to the factory, Tom was studying at the university of London.

   
   


2. 
   

   Before he came to the factory, Tom had studied at the University of London.