Simplify the following text for a Grade 12 native English-speaking person.
Original: On August 25 , 1958 , at the age of 48 , and after months of trial and error experimentation , Ando announced that he had finally perfected his flash-frying method and therefore invented the instant noodle .
Simplified: On August 25 , 1958 , at the age of 48 , and after months of trial and error experimentation to perfect his flash-frying method , Ando marketed the first package of precooked instant noodles .