It doesn't work like that, because the "complementary food" is just that: complementary. The main source of nutrition according to the WHO should still be breastfeeding until two years old. The typical recommendation is to start each meal by breastfeeding first, and then give some food afterwards as a "second course".

The mother can still go to work by using a breast pump to extract milk and leave it refrigerated or frozen, but the logistics are quite hellish and breast pumps not even always work.

All in all, and I say this as a parent that ideologically supports equality and believes that both parents should share parenting efforts equally... nature just doesn't work that way. At all. :(

Worked nicely just breastfeeding during the nights/mornings for us and most people I know after 12 months, and earlier should not be much of a problem IMHO, it's something you should be able decide on your own. It's not something to demand from mothers, because the stigma of not breast feeding can be pretty hard for a new mother and it is completly unnecessary to put that psychological pressure on someone..