QlikSense doesn't support this out of the box. You need to have the tasks in a sequence for best solution.
There are couple of solutions to it. We can have two dependent jobs that will write the job status in a excel sheet/ text file.
We can have a trigger job that will check if the jobs have completed in under <given> minutes from the time stamp values in the flat file. If the time does not match then it may sleep for sometime or exit the script directly. This will add three QVFs/tasks to the chain but the result will be similar to what you want.