Answer: Sentence structure varies depending on the writer’s purpose.
The factors that affect sentence structure are extremely varied, and they usually depend on the purpose of the author. Texts that are intended to be mostly informative tend to have simpler, more concise, shorter sentences. This is done in order for the reader to get the information in the most accessible way possible. On the other hand, texts that are written for entertainment can have very different structures depending on the author's style, topic, use of rhetorical devices and figures of speech, etc.
