Complex sentence: The automated vehicle operator is not functionally required to actively monitor the vehicle's performance while the automation system is engaged, but the operator must be available to resume driving within several seconds of being prompted to do so, as the system has limited conditions of automation.
Split into simpler sentences: The automated vehicle operator is not functionally required to actively monitor the vehicle's performance while the automation system is engaged. But the operator must be available to resume driving within several seconds of being prompted to do so, as the system has limited conditions of automation.