Complex sentence: Full employment, which was reached in 1942 and emerged as a long-term national goal around 1944, was not the goal of the WPA; rather, it tried to provide one paid job for all families in which the breadwinner suffered long-term unemployment.
Split into simpler sentences: Full employment, which was reached in 1942 and emerged as a long-term national goal around 1944, was not the WPA's goal. It tried to provide one paid job for all families in which the breadwinner suffered long-term unemployment.