This elite <e1>formation</e1> comprised of several regiments: Lifeguard <e2>dragoons</e2>, Lifeguard uhlans, Lifeguard hussars, and Lifeguard cossacks.
This elite formation comprised
This elite formation comprised of several regiments: Lifeguard dragoons, Lifeguard uhlans, Lifeguard hussars, and Lifeguard cossacks.
<triplet> formation <subject> dragoons <object> Member-Collection(e2,e1)