Add punctuation: Castor type Swivel castor or a castor with doubleaction brake diameter 125 mm a 100 mm diameter castor will be available at the end of this year
A: Castor type: Swivel castor or a castor with double-action brake, diameter 125 mm (a 100 mm diameter castor will be available at the end of this year)

Add punctuation: Computer simulations have become a useful part of mathematical modeling of many natural systems in physics chemistry economics and engineering
A: Computer simulations have become a useful part of mathematical modeling of many natural systems in physics, chemistry, economics and engineering.

Add punctuation: And they rose up early in the morning and worshipped before Jehovah and returned and came to their house at Ramah And Elkanah knew Hannah his wife and Jehovah remembered her
A:
And they rose up early in the morning and worshipped before Jehovah, and returned and came to their house at Ramah. And Elkanah knew Hannah his wife; and Jehovah remembered her.