Rewrite the given text with easier to understand wording.
The discovery that these enigmatic segnosaurs (including " Erlikosaurus " and " Segnosaurus ") were actually theropods helped clarify the relationships of " Therizinosaurus ".
This helped confirm they belonged to the same group of theropod dinosaurs as " Therizinosaurus " and that therizinosaurs were, more specifically, advanced, herbivorous maniraptoran theropods.