In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
One example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution is here: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Explanation: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this: In the feudal system ( in Europe and elsewhere ) , the nobility were mostly those who got land from the monarch and had to provide services to him , mainly military service .
Solution:
In the feudal system ( in Europe and elsewhere ) , the nobility were generally those who held a fief , often land or office , under vassalage , i.e. , in exchange for allegiance and various , mainly military , services to a suzerain , who might be a higher-ranking nobleman or a monarch .