Let's consider this sentence:
The postponement of marriage in order to accumulate credentials or job experience, the willingness to move to further career goals, and — in the case of bohemians — the willingness to accept incomes too low to support children in order to be an avant-garde writer or artist or revolutionary sets intellectuals and other elite professionals apart from the working-class majority whose education ends with high school and who rely on extended family networks for economic support and child care.
(Excerpted from Michael Lind - aldaily.com)
In the above sentence, the subject consists of three components separated by two commas. However, the main verb of this sentence, "sets", does not agree with the subject (since it contain three parts). Therefore, can someone elucidate this sentence for me? Thanks!