Complex sentence: The John Darwin disappearance case was an investigation into the faked death of the British former teacher and prison officer John Darwin, who turned up alive in December 2007, five years after he was believed to have died in a canoeing accident.
Split into simpler sentences: The John Darwin disappearance case was an investigation into the faked death of the British former teacher and prison officer John Darwin. Darwin turned up alive in December 2007, five years after he was believed to have died in a canoeing accident.