upload data and control from cosm

I s it possible to upload data to cosm and control arduino from cosm at the same time using 1 arduino??

One Arduino (with Internet connection) can send various requests to a server, or connect to different servers. I don't understand how you are planning to control the Arduino from cosm but the short answer is yes, you can read a feed and make the Arduino do something, and upload your data to cosm from the same Arduino. Doing both things exactly "at the same time" could be a challenge, but if you can accept to alternate between the two operations then it's feasible.