Complex sentence: The rank of sergeant does not exist in the Household Cavalry rather the equivalent is Corporal of Horse, this also applies to any other ranks with the word sergeant in it, such as Regimental Sergeant Major, which is replaced by Regimental Corporal Major.
Split into simpler sentences: The rank of sergeant does not exist in the Household Cavalry. The equivalent is Corporal of Horse, which also applies to any other ranks with the word sergeant in it, such as Regimental Sergeant Major, which is replaced by Regimental Corporal Major.