Complex sentence: Rational social action maintains a culture-bound value-rational order, legitimate in itself, by coordinating four instrumental actions judged by their efficiency: pattern maintenance, goal attainment, adaptation, and integration.
Split into simpler sentences: Rational social action has the end of maintaining a culture-bound value-rational order, legitimate in itself. Four instrumental actions, judged by their efficiency, are the means: pattern maintenance, goal attainment, adaptation, and integration.