Complex sentence: The controller is central to the correct function of an Xgrid, this node is responsible for the distribution, supervision and coordination of tasks on agents, the program running on the controller can assign and reassign tasks to handle individual agent failures on demand.
Split into simpler sentences: The controller is central to the correct function of an Xgrid, as this node is responsible for the distribution, supervision and coordination of tasks on agents. The program running on the controller can assign and reassign tasks to handle individual agent failures on demand.