Immigrant entrepreneurs are using Dubai as a platform from which to reach customers, often leveraging technology, talent, and affordable operations in their home countries while taking advantage of their own knowledge about local markets.

1. 红色部分是完整的单句。use ...as...结构，现在进行时。

2. 蓝色部分 often leveraging ...是现在分词短语，作方式状语。while ...修饰分词短语，是时间状语。