Simplify the following text for a Grade 13 native English-speaking person.
Original: This cipher algorithm was developed by two Belgian cryptographers , Joan Daemen and Vincent Rijmen , and submitted to the AES selection process under the name `` Rijndael '' , a portmanteau of the names of the inventors .
Simplified: The Rijndael cipher was developed by two Belgian cryptographers , Joan Daemen and Vincent Rijmen , and submitted by them to the AES selection process .