Final answer:
To create a complex sentence, the writer can add the phrase 'if we have free time in the afternoon.'
Step-by-step explanation:
To create a complex sentence, the writer could add the phrase 'if we have free time in the afternoon' to the end of the sentence. This would introduce a condition and add more information to the sentence. For example, the revised sentence would be 'We study mythology if we have free time in the afternoon.' This shows that studying mythology is dependent on having free time in the afternoon.
Learn more about Creating complex sentences