How did writing systems, like chinese symbols that emerged during the bronze age, change over time?

Writing symbols in pictorial writing systems tend to simplify as time goes on because most symbols are drawing of the thing that simplify over time. So the answer would be they simplify over time and become linked with more basic words. Such as a scythe and a piece of hay meaning harvest. Harvest is linked to the symbols of hay and scythe, as time goes on the symbol for harvest will become more different from the original two symbols it was built on

im pretty sure it has something to do with the end of ww1

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.