I have a kenmore HE2 electric dryer that does not dry clothes completely. Usually have to run the clothes through twice in order to get it dry.
Much thanks in advance

What setting do you use to dry the clothes? By means, do you use the automatic setting, wrinkle release, or just plain old fashioned timer?

We use the automatic sensor.

Start with the simple first.
Check behind the lint screen, through the blower chamber. Check the blower wheel, and clean the lint out of the area. This can be achieved normally by pulling the front off the dryer.

If that failes, you may have a faulty thermistor, or moisture sensor.