Complex sentence: The war started when the new land owners tried to remove the local settlers from the land they've just bought, but the locals refused to leave as they have settled much of their livelihood in the grant, which resulted in conflict and violence in 1875.
Split into simpler sentences: The war started when the new landowners tried to remove the local settlers from the land they had just bought. The locals refused to leave, as they had settled much of their livelihood in the grant, which resulted in conflict and violence in 1875.