Simplify the following text for a Grade 9 native English-speaking person.
Original: In some instances , such as on the island of Tanna in Vanuatu , cult members worship certain Americans , who brought the desired cargo to their island during World War II as part of the supplies used in the war effort , as the spiritual entity who will provide the cargo to them in the future .
Simplified: In other cases , such as on the island of Tanna in Vanuatu , cult members worship Americans who brought the cargo .