Is there any way i can switch the serial lines to control each seperatley with a single serial out from the uno?
In theory yes, but it involves using external logic components to switch the send and receive pins to the separate serial devices and of course you would have to manage that switching with extra code in your sketch. Easier to see if you can use the software serial library or even get a board with more hardware serial UART channels like the mega boards with four, or Bob's board with two.
Lefty