Simplify the following text for a Grade 2 native English-speaking person.
Original: Its discovery was announced by Scott S. Sheppard , David C. Jewitt , Jan Kleyna , and Brian G. Marsden on May 4 , 2005 , from observations taken between December 12 , 2004 , and March 9 , 2005 .
Simplified: It was found by Scott S. Sheppard , David C. Jewitt , and Jan Kleyna on December 12 , 2004 .