Simplify the following text for a Grade 10 native English-speaking person.
Original: Remus , the second moon , was discovered over three years later on August 9 , 2004 by Franck Marchis of UC Berkeley , and Pascal Descamps , Daniel Hestroffer , and JÃ rÃ me Berthier of the Observatoire de Paris , France .
Simplified: Remus , the second moon , was found over three years later on August 9 , 2004 by Franck Marchis of UC Berkeley , and Pascal Descamps , Daniel Hestroffer , and JÃ rÃ me Berthier of the Observatoire de Paris , France .