Complex sentence: The earliest and most interesting description of the Chagos, before coconut trees grew on the islands, was written by Manoel Rangel, a castaway from the Portuguese ship "Conceição" which ran aground on the Peros Banhos reefs in 1556.
Split into simpler sentences: The earliest and most interesting description of the Chagos, before coconut trees grew on the islands, was written by Manoel Rangel. He was a castaway from the Portuguese ship "Conceição" which ran aground on the Peros Banhos reefs in 1556.