What should the writer add to the end of the sentence in order to create a complex sentence?
in the morning before English and science.
but we also study math and geography.
if we have free time in the afternoon.
and we learn the history of Ancient Greece.
The writer should add "if we have free time later in the day" to the end of the sentence to create a complex sentence.
Therefore, the revised sentence would be: "In the morning before English and science, but we also study math and geography and we learn the history of Ancient Greece if we have free time later in the day."