Complex sentence: OS X users can accomplish this by holding down after powering the system, with the alternative of using launchctl reboot userspace-s in Terminal under OS X El Capitan after gaining superuser rights using sudo command.
Split into simpler sentences: OS X users can accomplish this by holding down after powering the system. The alternative of using launchctl reboot userspace-s in Terminal under OS X El Capitan after gaining superuser rights using sudo command.