Complex sentence: The East Sumatra Social revolution happened on 3rd March 1946 where several royal families in the region were murdered and the various sultanates were overthrown, which are also interlinked to ethnic tensions, though it was not the only factor that contributed to the revolution.
Split into simpler sentences: The East Sumatra Social revolution happened on 3rd March 1946, when several royal families in the region were murdered and the various sultanates were overthrown. It was also interlinked to ethnic tensions, though this was not the only factor that contributed to the revolution.