Hi Roffen,
You can move clips around by drag and drop. The simplest way to move a clip to the end is dragging the clip toward the end. Release the mouse when the beginning of the clip passed the end(inside the empty space). It doesn't matter how far away from the end as the gaps will be automatically removed. You can re-order clips in the sequence by repeatedly dragging clips to the end.
Please beware of that if you drag a clip on top of another clip, the clip underneath will be automatically split(insertion). The split position is at the beginning of the top clip. If the beginning of the dragged clip is snapped to a join, then the clip will be inserted into the join without split any clip - This is another way to change the order.
Hope this helps. If you find anything wrong or confusing, please let us know.
Best regards.