Complex sentence: His last known communication is a letter mailed to his girlfriend on May 22,2000 from the village of Bario, in the Kelabit Highlands, Sarawak, where he had returned to meet the nomadic Penan he lived with for so long.
Split into simpler sentences: His last known communication is a letter mailed to his girlfriend on May 22,2000 from the village of Bario, in the Kelabit Highlands, Sarawak. Where he had returned to meet the nomadic Penan he had lived with for so long.