Complex sentence: Situated on the east coast of Sri Lanka, the district was hit hard by the tsunami caused by Indian Ocean earthquake in 2004, which caused 3,177 dead or missing persons and affected 255,000 people in in the district.
Split into simpler sentences: Situated on the east coast of Sri Lanka, the district was hit hard by the tsunami caused by Indian Ocean earthquake in 2004. The tsunami resulted in 3,177 dead or missing persons and affected 255,000 people in in the district.