Can you help me understand this page from Engels?

What he is saying (implying) is that, in order for women to be liberated (freed from the bonds of housekeeping), all females must return to public industry (working outside the home), which demands (will result in) the abolition (destruction) of the monogamous (one man/one woman who are faithful to each other) family as the economic unit of society (traditionally, the man works while the woman remains at home caring for the children). He believes that if women are free to work outside the home, the basic structure of marriage will be destroyed.