The rule about splitting infinitives is that it should be avoided. If you can avoid inserting a word between TO and the verb, you should. Split infinitives are grammatically incorrect which is why you shouldn't use them. So, to correct this quote, you should do the following: "To go boldly where no one has gone before."
Text structure refers to how the information within a written text is organized. This strategy helps students understand that a text might present a main idea and details; a cause and then its effects; and/or different views of a topic.