Final answer:
The needless complexity in the sentence is exemplified by the repetitive phrases 'an evaluation, an assessment'.
Explanation:
Needless complexity in a sentence example:
The best example of needless complexity in the sentence "Each teacher must do an evaluation, an assessment of each lesson" is the repetition of similar concepts with the phrases an evaluation, an assessment. This redundancy adds unnecessary complexity without adding any significant value to the sentence.
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