3 sentences

1. 古代社会存在着森严的等级制度。

   gǔ​dài shè​huì cún​zài zhe sēn​yán de děng​jí zhì​dù.

   A strict hierarchy existed in ancient society.

   Source: Dong Chinese Dictionary

2. 古代社会的等级制度极其森严，不容僭越。

   gǔ​dài shè​huì de děng​jí zhì​dù jí​qí sēn​yán, bù róng jiàn​yuè.

   The social hierarchy in ancient times was extremely strict and could not be transgressed.

   Source: Dong Chinese Dictionary

3. 在古代等级制度中，小人指代地位低微的人。

   zài gǔ​dài děng​jí zhì​dù zhōng, xiǎo​rén zhǐ​dài dì​wèi dī​wēi de rén.

   In the ancient hierarchy, 'xiaoren' referred to people of low social status.

   Source: Dong Chinese Dictionary