Modifiers can be more than one describing the same noun to make it more precise or interesting. They can be a phrase, or multiple-word, or even just one word modifying a whole sentence. The modifiers must be easily identifiable with the words they modify.
The meal in that restaurant was really delicious.
The phrase in the restaurant modifies the noun meal. It tells us where the meal is/was available, and really delicious also modifies meal. It tells us about the taste of the meal. The adverb really modifies the adjective delicious. It tells us how delicious the meal was.
They were highly delighted at the court’s decision.
The adverb highly modifies how they felt, that is delighted. The adverbial phrase at the court’s decision modifies the adjective delighted. It tells us what made them delighted.
Suddenly, the ground shook and everyone rushed outdoors.
Suddenly modifies the whole sentence. Outdoors is an adverb and it modifies the verb rushed.
The hungry-looking vultures were perched high on the steep cliff overlooking the slightly choppy sea.
Covered by a thick layer of fine dust, the top shelf had not been wiped for years.
Firstly Adjective thick modifies noun phrase layer of fine dust; adjective fine modifies noun dust; Secondly adjective top modifies shelf; and covered by a thick layer of fine dust modifies top shelf.
It was the ugly toothless old wicked witch, who cast a magical spell on the beautiful princess.
A whole string of adjectives – ugly toothless old wicked – modifies noun witch; adjective magical modifies noun spell; adjective beautiful modifies noun princess; and who cast a magical spell on the beautiful princess modifies witch.
The highly experienced driver drove very quickly through the tunnel.
Not: The highly experienced and very quickly driver drove through the tunnel.
This sentence is wrong because the adverb quickly modifies the noun driver. An adverb does not modify a noun. The adverb highly modifies the adjective experienced. The adjective experienced modifies the noun driver. The adverb very modifies the adverb quickly. The adverb quickly modifies the verb drove. The prepositional phrase through the tunnel modifies the verb drove.