Complex sentence: In spite of that, emigration of Mexicans continued throughout the rest of the century at varying degrees, but it grew significantly during the 1990s and has continued to do so in the first years of the 2000s.
Split into simpler sentences: In spite of that, emigration of Mexicans continued throughout the rest of the century at varying degrees. It grew significantly during the 1990s and has continued to do so in the first years of the 2000s.