Complex sentence: In the period 1971--81, the social wage grew faster than the money wage; the money wage grew by 45 percent for workers and employees and 72 for workers at collective farms, in contrast, per capita income from social wages increased by 81 percent.
Split into simpler sentences: In the period between 1971--81, the social wage grew faster than the money wage; the money wage grew by 45 percent for workers and employees and 72 for workers at collective farms. In contrast, per capita income from social wages increased by 81 percent.