If the rise in Yen is against the dollar, you could say...
Due to the rise in the Yen against the dollar, American goods have become less expensive in Japan, and exports from the US to Japan have increased.
...or some such blither.
"Due to the rise in yen, smooth flow of currency".
I know it's a fragmented phrase. I actually don't know what happens when there's been a rise in yen, so I'm basically wondering if it even causes currency to flow smoothly...?