Final answer:
The revised concise sentence avoids repetition by eliminating unnecessary phrases and redundant terms, clearly conveying the message with fewer words.
Step-by-step explanation:
The best way to rewrite the sentence to avoid repetition would be: "Selena encountered an unexpected surprise when she attempted to replicate a dish from culinary school." This sentence is clear and avoids the redundancy of the original by eliminating unnecessary phrases such as 'duplicate a copy' and 'culinary dish she learned in culinary school,' which improperly suggest that the dish is both being duplicated and learned simultaneously.
In making sentences concise, it is crucial to cut needless words and simplify your message. Avoid repeating the same idea or using redundant words like 'unexpected surprise,' as a surprise by definition is unexpected. Applying these principles of conciseness can improve your writing significantly, much like distilling the 49-word sentence to a more potent 16-word sentence or further down to a core 3-word-phrase.