Original sentence: Several Polish students associations were established and the number of Polish students reached around 10%, Jewish students were around 16% which reflected the multiethnic character of the University and the city itself.The professors left the city in January 1945, many of the buildings were partially destroyed during the defence of the city
Edited sentence: Many of  the buildings were partially destroyed during the defence of the city.Poles who became minority due to Germanisation of Wrocław established several Polish students associations and the number of Polish students reached around 10%, Jewish students were around 16% which reflected the multiethnic character of the University and the city itself.Six years after banning Poles from the University and declaring that Poles will never be allowed to return, the German professors left the city in January 1945 after Germany lost the Second World War , only to be replaced by Polish academics