Before revision: It describes a couple without children living together while both partners are receiving an income; because both of their wages are coming into the same household, they are free to live more comfortably than couples who live together and spend their money on raising their children.
After revision: It describes a couple without children living together while both partners are receiving an income; because both of their wages are coming into the same household, they are able to live more comfortable economically than couples who live together and spend their money on raising their children.