What makes this passage an example of expository sentence

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

Which major world event was near the birth of the modernist movement

At four hundred miles they stopped to eat, at a thousand miles they pitched their camp. they had traveled for just three days and nights, a six weeks' journey for ordinary men. this excerpt is repeated several times. how does this repetition affect the epic?