Original: He undertook gigantic projects , including the first version of the Great Wall of China , the now famous city-sized mausoleum guarded by a life-sized Terracotta Army , and a massive national road system , all at the expense of many lives .
Simplified: They had a lot of huge projects , including the Great Wall of China , a city-sized mausoleum guarded by a life-sized Terracotta army , and a system of roads that went all over the nation .