求英语高手分析句子中making it possible for them做什么成分?

后面半句好像没写完
The two countries are highly complementary in economic and trade areas,making it possible for them to share each other's huge market
两国经贸领域的互补性很强,双方可以彼此分享巨大的市场.
making it possible for them to ...是状语从句,是对主句的补充