Original sentence: Bulgaria also sustained the highest number of casualties in the war - as much as those of Serbia and Greece combined.Greece and Serbia accuse Bulgaria for arrogant behaviour (see the Cretan Gendarmerie).Therefore Bulgarians believed that their rightful territory claims according to pre-war treaties were occupied by serbian and greek forces, which after the war refused to surrender it to Bulgaria.They also claimed that the majority of the population in the liberated areas was of Greek origin which Bulgarians contested.Thus Greeks claimed the pre war agreement between Greece and the other Christian States of the Balkans was that everyone "holds what he gets"
Edited sentence: Also the majority of the population in the liberated areas was of Greek origin.Bulgaria sustained the highest number of casualties in the war - as much as those of Serbia and Greece combined.Bulgarians said that their "rightful territory claims" according to pre-war treaties were occupied by serbian and greek forces, which after the war refused to surrender it to Bulgaria.Greece and Serbia accuse Bulgaria for arrogant behaviour (see the Cretan Gendarmerie) and atrocities against non Bulgarian Christian population (The Greek city of Drama was burned 3 times in past century by Bulgarian troops).Thus the pre war agreement between Greece and the other Christian States of the Balkans was that everyone "holds what he gets"