Complex sentence: In a self-managing autonomic system, the human operator takes on a new role: instead of controlling the system directly, he/she defines general policies and rules that serve as an input for the self-management process.
Split into simpler sentences: In a self-managing Autonomic System, the human operator takes on a new role: he or she does not control the system directly. Instead, he/she defines general policies and rules that serve as an input for the self-management process.