<p>why both these sentences are correct?</p>
<p>sentence 1 :
“Before a complete version of Louisa May Alcott’s novel Little Women appeared in 1880, the book had been published in two separate volumes.”</p>
<p>sentence 2 :
“Before a complete version of Louisa May Alcott’s novel Little Women appeared in 1880, the book was published in two separate volumes.”</p>