Complex sentence: They initially consider themselves lucky to hire the Spruills, a family of "hill people," and a few of the Mexicans who annually come to the area looking for work.
Split into simpler sentences: They initially consider themselves lucky to find the Spruills, a family of "hill people", looking for some work. Along with the Spruills, the family hires a few of the Mexicans that come to the area annually looking for work.