Complex sentence: In December 2012, she was called up to the senior Canadian team for the 2013 Four Nations Tournament, making her first international appearance against China on January 12,2013, scoring the game-winning goal in a 1--0 victory.
Split into simpler sentences: In December 2012, she was called up to the senior Canadian team that played the 2013 Four Nations Tournament. She made her first international appearance in that tournament against China on January 12,2013, scoring the game-winning goal in a 1--0 victory.