Here is the original item:
Karlene drove slowly through the heavy
traffic. (A)
Anticipating a bag of microwave
popcorn (B)
and a couple of hours in front of the
television (C)
as her reward for a hard day at work.
You wanted to do this:
Karlene drove slowly through the heavy traffic. Anticipating a bag of microwave
popcorn and a couple of hours in front of the television.
As her reward for a hard day at work.
Adding a period after television causes a fragment. As her reward for a hard day at work, a string of prepositional phrases, cannot stand alone as a complete sentence.
You might want to review the rules.