What you can try to do is create two scrolling text blocks at the same time. one starting at the end of the other, when the bounds of the first are off screen, reset its position to where the other started and continue looping.
I would create a Boolean in the event tick to check position of (currently visible text block). If position >= end position then set position to desired location, set second scrolling text block as the (currently visible text block) and reset the Boolean.