Original sentence: In The Rescue of Pluffles, Pluffles is a subaltern (2nd Lieutenat) in a regiment known (for   a concealing mickmname) 'The Unmentionables'
Edited sentence: In The Rescue of Pluffles, Pluffles is a subaltern (2nd Lieutenant) in a regiment known (for a concealing nickname) 'The Unmentionables'