Simplify the following text for a Grade 9 native English-speaking person.
Original: Albert Fert ( born 7 March 1938 in Carcassonne , Aude ) is a French physicist and one of the discoverers of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks .
Simplified: Professor Albert Fert is a French physicist who was born on March 7 1938 . He discovered giant magnetoresistance which was used to make gigabyte hard disks much easier to build .