Complex sentence: Milling was done by women, and the lyrics are about women's life, as well as the work itself: about the millstones, the difficulty of the work, feelings of love and family relationships.
Split into simpler sentences: Milling was done by women, and the lyrics are about women's life, as well as the work itself. They sing about the millstones, about the difficulty of the work, about feelings of love, about family relationships.