Complex sentence: The Wall is manned by the order of the Night's Watch: a set of warriors sworn to serve on the Wall for life, foregoing marriage, titles, property and children, and they wear clothing dyed only in black.
Split into simpler sentences: The Wall is manned by the order of the Night's Watch. Men of the Night's Watch swear an oath to serve on the Wall for life, foregoing marriage, titles, property and children, and they wear clothing dyed only in black.