Complex sentence: Sri Lankan state sponsored colonisation schemes of majority Sinhalese in the northern or eastern parts of the island, traditionally considered to be minority Sri Lankan Tamil regions, has been perhaps the most immediate cause of inter-communal violence.
Split into simpler sentences: Sri Lankan state sponsored colonisation schemes refers to government backed establishment of Sinhalese communities in regions traditionally considered to be Sri Lankan Tamil lands in the northern or eastern parts of the Sri Lanka. It has been perhaps the most immediate cause of inter-communal violence.