verb tense

[arzgol]

Are my centences correct?

To create large interior spaces, Romans used arch structures which eliminate the need for columns. Arch structures enable Romans to spand spaces while supporting weight.
　

Thank you for your responce.

[Rover_KE]

Are my sentences correct?

To create large interior spaces, the Romans used arch structures which eliminated the need for columns. Arch structures enabled the Romans to expand spaces while supporting the weight of the upper storeys.
　

Thank you for your response.

A better thread title would have been To create large interior spaces. . .

Rover

[arzgol]

Thank you so much Rover. I know it is too late. God bless you.

[bhaisahab]

You could also use "span" instead of "expand". That's the word I would use in the context.