Complex sentence: John Clunies-Ross was a merchant originating from the Shetland Islands, who first cruised the waters of the then uninhabited Cocos (Keeling) Islands in 1825.
Split into simpler sentences: John Clunies-Ross was a merchant originating from the Shetland Islands. Reportedly he first cruised the waters of the then uninhabited Cocos (Keeling) Islands in 1825.