Complex sentence: They are the Rare Earth Materials Chemistry and Applications state key laboratory, which is associated with Peking University, and the Rare Earth Resource Utilization state key laboratory located in Changchun, Jilin province.
Split into simpler sentences: They are the Rare Earth Materials Chemistry and Applications state key laboratory, which is associated with Peking University. The other laboratory is the Rare Earth Resource Utilization state key laboratory located in Changchun, Jilin province.