This study is designed for patients diagnosed with MET-driven, unresectable and locally advanced or metastatic Papillary Renal Cell Carcinoma. The purpose of this study is to see if an investigational new anti-cancer medication, savolitinib, is effective in treating patients with MET-driven PRCC, how it compares with another medication frequently used to treat this disease called sunitinib, and what side effects it might cause.