Question

Is the following sentence missing commas? If so where?: After the lifeguards closed the beach because of the storm we walked along the boardwalk.

Answer 1

Yes, needs a COMMA.

Explanation:

After the life guards closed----after is a connecting word for starting the dependent clause having a phrase "because of the storm",
It is the rule of AP style that after the dependent clause, starting the independent clause you have to use a COMMA for more clarity.

After the life guards closed the beach because of the storm, we walked along the boardwalk.

Now the sentence looks clear.
It is a complex sentence.

Answer 2

After the lifeguards closed the beach because of the storm, we walked along the boardwalk.

Explanation:

Place a comma after the introductory clause ("After the lifeguards closed the beach because of the storm").