Simplify the following text for a Grade 5 native English-speaking person.
Original: Diego VelÃ zquez de CuÃ llar ( 1465 , CuÃ llar , Spain -- ca . June 12 , 1524 , Santiago de Cuba ) was a Spanish conquistador .
Simplified: Diego VelÃ zquez de CuÃ llar died in Santiago de Cuba in 1524 .