What is the prepositional phrase to According paper this concet good?

The phrase "according to this paper" is a prepositional phrase. It acts as an adjective phrase modifying the noun "concet" (which I assume is a typo and should be "concept").

Here's how it breaks down:

* Preposition: "According"

* Object of the preposition: "this paper"

The entire phrase tells us the source of the information about the concept being good.