Complex sentence: During the winter they resided in half-buried dwellings built with cottonwood logs and arrowweed covered in earth, while in the summer they lived in open-air flat-roofed houses known as "ramadas".
Split into simpler sentences: During the winter, they lived in half-buried dwellings built with cottonwood logs and arrowweed covered in earth. In the summer they lived in open-air flat-roofed houses known as "ramadas".