A- Complex. When a sentence contains the word "when," it is complex. Hope this helps.
What is the sentence if I may ask ?
Answer: I think it is cowboy but I am not sure
Explanation:
<span>The only place for the topic sentence is in the beginning as its purpose is to attract readers so that they would like to read a work till the end. So, to answer your question, the topic sentence should never be in the last lines, where the conclusion <span>of the whole work is written.</span></span>