Original sentence: Several researchers at the universities of Cambridge and Oxford have post-humously diagnosed Einstein with Asperger's  , although other researchers at Stanford and Vanderbilt disagree with the disagnosis, or feel that it impossible to properly disgnose from historical documention
Edited sentence: Several researchers at the universities of Cambridge and Oxford (the two oldest Universities in the English-speaking world, located in the United Kingdom) have post-humously diagnosed Einstein with Asperger's  , although other researchers at Stanford and Vanderbilt disagree with the disagnosis, or feel that it impossible to properly disgnose from historical documention