Simplify the following text for a Grade 4 native English-speaking person.
Original: In 1998 , the Explorer was the first ship to circumnavigate James Ross Island ; and the same year , she is claimed to have been the first ship , as distinct from river boat , to sail 80 m above Iquitos , Peru , to the point where the MaraÃ Ã n and Ucayali rivers meet to become the Amazon River .
Simplified: In 1998 Explorer was the first ship to sail around the James Ross Island ; .