Original: It is also suggested by some that because Stoker was a friend of a Hungarian professor (Arminius Vambery/Hermann Bamberger/Ármin Vámbéry) from Budapest, Vlad's name might have been mentioned by this friend.
Simplified: Stoker was a friend of a Hungarian professor (Arminius Vambery/Hermann Vamberger) from Budapest, and many have suggested that Vlad's name might have been mentioned by this friend.