Add punctuation: owever Mechel did own a single 100 genuine Holbeindrawing and that was Holbeins pen and wash drawing of a dagger sheath
A: owever, Mechel did own a single 100% genuine Holbein-drawing and that was Holbein's pen and wash drawing of a dagger sheath.

Add punctuation: Fire protection class Cfl hardly inflammable
A: Fire protection class Cfl (hardly inflammable)

Add punctuation: It was fascinating again to see how fast these numbers grew
A:
It was fascinating, again, to see how fast these numbers grew.