Why are sentences after auxiliary words omitted in Japanese?

Everyone can understand. You will understand after learning Japanese. The simplest thing is that に and へ have similar meanings. I. Go to the office after work. Second: the Warring States (since) Edo period. Third: Minister Hideyoshi, everyone in the world. If you don't know ... words are basically fixed verbs, basically unchanged or have been said deeply, you don't say it.