求翻译：自1932年Berl与Means提出两权分离命题后，现代企业管理的一个重要理论----理论委托代理理论，逐渐形成了。是什么意思？

Since 1932, Berl and upon the separation of ownership proposition Means, an important theory in modern enterprise management----theory of principal-agent theory, gradually formed.