Simplify the following text for a Grade 8 native English-speaking person.
Original: When the Spaniards came to the island in 1492 , the native population was 400,000 ( estimated ) but in 1508 there were only 60,000 Indians .
Simplified: When the Spaniards arrived in 1492 , the native population was estimated to be about 500,000 . According to a census taken in 1507 , the native population had been reduced to 60,000 .