Instructions: In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Input: The southern beeches ( genus " Nothofagus " ) previously thought closely related to beeches , are now treated as members of a separate family , the Nothofagaceae ( which remains a member of the order Fagales ) .
Output:
The southern beeches Nothofagus previously thought closely related to beeches , are now treated as members of a separate family , Nothofagaceae .