‘Is the lessons’ and ‘apply in his life’ are correctly used in the sentence, aren’t they?
What is more essential than Bob’s success in his career as a businessman is the lessons he has learned from his failures, lessons that he can apply in his life.
For me, it should be " are the lessons". Some people may feel that stronger punctuation than a comma is needed. "apply in his life" is fine.
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For me, it should be "are the lessons". Some people may feel that stronger punctuation than a comma is needed. "apply in his life" is fine.