Simplify the following text for a Grade 7 native English-speaking person.
Original: While words are generally accepted as being ( with clitics ) the smallest units of syntax , it is clear that in most languages , if not all , words can be related to other words by rules ( grammars ) .
Simplified: Words are accepted as being the smallest units of a sentence ( syntax ) . It is clear that in most languages , words can be related to other words by rules .