英语高手们帮我分析一句话

英语高手们帮我分析一句话今天做阅读有这样一句话：xing Xu and his colleagues at the Chinese Academy of Sciences in BeiJing said that their examination of Xiaotingia,in comparsion with more bird skeletons from the same period as well as the 150-million-year-old Archaeopteryx,showed that several of its features,like the long and strong forelimbs onces thought to be basic of birds,were actually common to a group of dinosaurs known as deionychosaurs.这是一句话,其中Xing Xu是一个人名,Xiaotingia是一个恐龙的名字叫赵氏晓廷龙,这句话我之能看的懂主句,修饰的中间一大堆我大概认为是插入语,结构和意思都看不懂,请高手帮我分析分析,谢谢!