The answer to this question is complex.
One of the complex sentence patterns is: Although sentence, sentence. This pattern is modeled above; however, instead of using the word although, we used a similar word, "when".
Other complex patterns are: "Sentence, although sentence" and "Sentence although sentence". On the other hand, some compound sentence patterns are "Sentence; sentence", "Sentence; however, sentence", "Sentence, and sentence."
Hope this helps!
