Insert a line break within a cell after a specific character

Please try
=SUBSTITUTE(SUBSTITUTE(B3,", ",","&CHAR(10)),"? ","?"&CHAR(10))

Unclear where you want the fix to be.

sheets event code revision would be

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or using a formula

=SUBSTITUTE(B3,CHAR(9),CHAR(10))

	A	B	C
3	Click to see pop up message	Please provide answers to the following questions, 1.What is your name? 2. Where are you from? 3. How old are you? 4. What language do you speak?	Please provide answers to the following questions, 1.What is your name? 2. Where are you from? 3. How old are you? 4. What language do you speak?

	A	B	C
3	Click to see pop up message	Please provide answers to the following questions, 1.What is your name? 2. Where are you from? 3. How old are you? 4. What language do you speak?	=SUBSTITUTE(SUBSTITUTE(B3,",",","&CHAR(10)),"?","?"&CHAR(10))