Simplify the following text for a Grade 7 native English-speaking person.
Original: It was the second centaur found by him ( 5145 Pholus being his previous find ) , and the third centaur discovery ( 2060 Chiron was the first ) .
Simplified: It was the second centaur found by him ( 5145 Pholus being his first ) , and the third centaur to be found ( 2060 Chiron was the first ) .