Complex sentence: Trotsky believed that the development of the international division of labor made economic isolation from the world, reactionary in its own right; yet, Trotsky also acknowledged that dependence upon the international capitalist market leads to economic plans becoming subordinate to world capitalism.
Split into simpler sentences: Trotsky believed that the development of the international division of labor made economic isolation from the world, reactionary in its own right. Yet, Trotsky acknowledged that dependence upon the international capitalist market leads to economic plans becoming subordinate to world capitalism.