Hello there,
Thank you so much for using our theme and contacting our support.
You can easily create such grid with Visual Composer. So you need to edit your page via admin panel -> pages, then add there a row with two columns and place “Promo banners” elements to each column. One to the left column and two to the right one. If you will not able to do this please provide your admin access so we could try to help you.
Regards