Complex sentence: Nearly 100 "Psittacosaurus" skeletons were excavated in Mongolia during the summers of 2005 and 2006 by a team led by Mongolian paleontologist Bolortsetseg Minjin and American Jack Horner from the Museum of the Rockies in Montana.
Split into simpler sentences: Nearly 100 "Psittacosaurus" skeletons were excavated in Mongolia during the summers of 2005 and 2006. The team was led by Mongolian paleontologist Bolortsetseg Minjin and American Jack Horner from the Museum of the Rockies in Montana.