Is the puck is something that you must watch at all times a run on sentence

According to the given sentence The puck is something that you must watch at all times. "Is not a example of a run on sentence." A run on sentence is two sentences that are best fit being one sentence instead of two. For example My cats name is Fred. He is really fluffy. would be a example of a run on sentence because the two sentences are best fit being one so it should be My cats name is Fred he is really fluffy.

Hope this helps.

hey! what was the rest of the question?