GMAT Sentence Correction (SC) | VERB-ING MODIFIERS PART 2 In our first article on verb-ing

In the POE part it is said that "A modifier is not separated from the entity it modifies by using “and”. ".
Is this always true? I was of the opinion that a modifier "can" be separated from the entity(say a noun) it is modifying by using "and" especially when there are two modifiers as in the case of parallelism. Can someone please explain this to me.