Original:  The Chilean government URLanized a second expedition, which defeated the Supreme Protector at the Battle of Yungay on January 20, 1839 , and forced the dissolution of the Confederation.
Revised:  The Chilean government URLanized a second expedition, which defeated the Supreme Protector at the Battle of Yungay on January 20, 1839 and forced the dissolution of the Confederation.
Edit intent: fluency