sat 语法题Studying dance for many years,practing difficult step

sat 语法题
Studying dance for many years,practing difficult steps every day,and (frequent performances has enabled the young dancer) to secure the leading role in the spring production.
performing frequently enabled the young dancer
总觉得这句话好像哪个地方语法不对,读起来特别扭~
还有一道题：After the upring October 10,1911,that (has led) to( the establishment of) a Chinese republic,many Chinese Americans decided to return to China( in) hopes of a bright future( there).
这个题是has led,这个哪里错了？