A protagonist's goal might change as a causal consequence of a recognition brought on by pursuing a first goal. The reversal can fall at any major turn: inciting crisis, realization crisis, climax turn, tragic crisis, or final crisis. Frodo's goal, for instance at the outset is to have an adventure like Bilbo's. Frodo's goal changes, albeit reluctantly, during the inciting crisis brought on by a dramatic visitation from Gandalf when he has realized the Ring's significance. However, the main dramatic complication introduced in The Hobbit doesn't change and isn't resolved until the denouement of the final installment.
By definition, a simple plot straightforwardly pursues one goal without anagnorisis (profound recognition of the true state of circumstances) or peripetia (an abrupt, profound reversal of circumstances); a complex plot has one or both anagnorisis and peripetia and they can stand alone or go hand in hand. Theoretically, a plot can have one or both at each major turn, up to five anagnorises and five peripetias. However, that degree of plot complexity is challenging to write and challenging to read.
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