Add punctuation: Antiknock preparations oxidation inhibitors gum inhibitors viscosity improvers anticorrosive preparations and other prepared additives for mineral oils incl gasoline or for other liquids used for the same purposes as mineral oils
A: Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils, incl. gasoline, or for other liquids used for the same purposes as mineral oils

Add punctuation: Rejoice ye in that day and leap for joy for behold your reward is great in heaven for in the like manner did their fathers to the prophets
A: Rejoice ye in that day, and leap for joy: for behold, your reward is great in heaven: for in the like manner did their fathers to the prophets.

Add punctuation: All his fighting spirit that he made use of in his books remained but now was the stronger and he began writing a series of books plays and poems
A:
All his fighting spirit that he made use of in his books remained but now was the stronger and he began writing a series of books, plays and poems.