Simplify the following text for a Grade 10 native English-speaking person.
Original: It was discovered by the Cassini Imaging Science Team in images taken by the Cassini-Huygens probe on June 21 , 2004 and announced on September 9 , 2004 .
Simplified: It was first seen by Carl Murray of the Cassini Imaging Science Team in pictures taken by the Cassini-Huygens probe on June 21 , 2004 , and announced on September 9 , 2004 .