Original sentence: However, it seems that during the late 1950s and early 1960s there was little or no violent repression of opposition to the Sangkum, and the country as a whole experienced a period of comparative stability
Edited sentence: However, it seems that during the late 1950s and early 1960s there was relatively little or no violent repression of opposition to the Sangkum, and the country as a whole experienced a period of comparative stability.The one exception was again the Khmer Serei, who were dealt with harshly: Preap In, a Khmer Serai activist who attempted to negotiate with Sihanouk in 1963, was arrested and his subsequent execution shown in cinemas across the country