Answer: Running in the relay, Bob tripped and fell.
A phrase is a set of words that do not have a verb or subject. With this, it can't stand alone as a sentence. On the other hand, independent clause is a set of words that has both verb and subject. With this, it can stand alone as a sentence since that it already has the idea.
In the sentence, the phrase is the "Running in the relay" because it has no verb or subject. And the independent clause is the "Bob tripped and fell" because it has a subject which is "Bob" and a verb which is "tripped and fell."
