Overflowing tabs and sub tabs – Desktop view

How do we solve multi-level navigation? In the current design, I have added arrows on both sides and at both levels as well. But this design looks odd.

Tab 1 to Tab 12 -- Primary tab
Tab 1-1 to Tab 1-12 -- Sub level of tab 1

Other option: Have a "More" element with the drop-down for primary tab and the secondary will have the arrow option.
The problem would be that I have 2 designs for the same tab. In addition to this, if the primary tab only has one option the drop-down menu wouldn't make sense.

Is there any solution available to solve this problem?