Is there a difference between this:

We make that more effective and pleasant.
We make that more effective and more pleasant.

Can we omit the second 'more'?

Question

Is there a difference between this:

We make that more effective and pleasant.
We make that more effective and more pleasant.

Can we omit the second 'more'?

Answer

Yes, you can omit it. 
If you include the second "more" it adds a feeling of emphasis, but it's a bit smoother if you omit it.