“In this case, a number of specimens all previously identified as Brontosaurus in the past do actually come out together as close relatives of one another, and, although still close to Apatosaurus, are separate from this genus and show several distinct features that suggest they are different. Since the name Brontosaurus already exists for these animals, a new name doesn’t need to be created and instead the ‘thunder lizard’ (surely this wonderfully evocative translation is a large part of its popularity) is resurrected for them and thus returns to the ranks of the dinosaurs.”
Actual scientific paper (which does mention the resurrection of Brontosaurus in the abstract but focuses on other aspects of Diplodocidae systematics and taxonomy):
https://peerj.com/articles/857/
And a little bit more from the authors:
https://peerj.com/blog/post/111369042783/emanuel-tschopp-diplodocidae/