Final answer:
The sentence should be corrected by replacing the misspelled word 'lcnicnsy' with the correct term 'leniency'. The rest of the sentence is appropriately structured with the correct use of commas and verb tense.
Step-by-step explanation:
The correct edit to make the sentence "Judge Lemon who was famous for throwing the book at repeat offenders, surprised the courtroom with her lcnicnsy." is to replace "lcnicnsy" with "leniency". The correct sentence should read: "Judge Lemon, who was famous for throwing the book at repeat offenders, surprised the courtroom with her leniency." No other edits are necessary, as the rest of the sentence is grammatically correct, including the use of the comma to set off the nonrestrictive clause and the past tense verb "surprised".