Which statement shows the best way to revise this complex sentence, making it a compound sentence instead?

After I submitted an application, the employer asked me to come by for an interview.
I submitted an application, and the employer asked me to come by for an interview.
The employer asked me to come by for an interview after submitting an application.
After I submitted an application, an interview was asked for by the employer.
After submitting an application, the employer asked me to come by for an interview.

A complex sentence differs from a compound sentence because in a complex sentence one of the clauses is dependent, which means it requires another clause to have a complete meaning.

This occurs in the sentence After I submitted an application, the employer asked me to come by for an interview, because the sentence after I submitted an application does not express a complete idea and requires the second sentence to be complete.

Moreover, you can modify this sentence and make it a compound sentence by making sure each of the sentences has complete meaning and by including one coordinative conjunction such as and, or, but.

In this context, the revised sentence is I submitted an application, and the employer asked me to come by for an interview.

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