Complex sentence: Peter Grünberg (May 18,1939) is a German physicist, and Nobel Prize in Physics laureate for his consequential discovery with Albert Fert of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks.
Split into simpler sentences: Peter Grünberg (May 18,1939) is a German physicist. He is one of the discoverers of giant magnetoresistance which brought about a breakthrough in gigabyte hard disks.