Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

Example Input: What keeps the sensitivity of hormones at the same level, oh I mean the immune system?
Example Output: What keeps the sensitivity of the immune system at the same levels? 

Example Input: What conditions must be met for a prescription for a controlled substance to be invalid no rather valid?
Example Output: What conditions must be met for a prescription for a controlled substance to be valid?

Example Input: The function of long-lived memory cells is an example of which or no make that what kind of immune response?
Example Output:
The function of long-lived memory cells is an example of what kind of immune response?