Complex sentence: In January 1841, "Cruizer" recaptured the whaling brig "Pilot", which had been captured in the Nicobar Islands by the local inhabitants, who murdered most of her crew.
Split into simpler sentences: In January 1841, "Cruizer" recaptured the whaling brig "Pilot". The local inhabitants in the Nicobar Islands had captured her and murdered most of her crew.