I believe that with the way you have it you will have to delete the second partition, so there is 208gb unallocated space, then extend the first partition and recreate the second partition. This is what I had to do as when the second partition is shrunk the emtpy space is after the second partition and the first can't access it. Hope that makes sense, bear in mind that the last time i had to do it was about 8 years ago so things may have changed. Also note that deleting the second partition will remove all data stored in it.