Simplify the following text for a Grade 9 native English-speaking person.
Original: It was discovered and described in 2003 in rocks of the Yixian Formation in Liaoning Province , China , by a team of scientists including Zhe-Xi Luo and John Wible .
Simplified: It was discovered and described in 2003 in rocks of the Yixian Formation in Liaoning Province , China , by a team of scientists .