In particular, if schools changed their start times it can greatly affect the students test scores, for example, after many high schools in minnesota changed their start times they noticed that many students grades in some classes rose up to a full grade point.
can somebody notice a run on sentence?

How does this excerpt develop the central idea that espionage during the civil war was often carried out by untrained citizens? it enhances the reader’s understanding by explaining why training was unnecessary. it changes the reader’s perception of what information a spy was able to obtain. it explains an ordinary person’s motivation for conducting espionage against the enemy. it adds moral complexity to espionage, due to the use of secret and dangerous methods.