Split words by uppercase in Google Sheets
=REGEXREPLACE(B2,"([a-z])([A-Z])","$1,$2")
=REGEXREPLACE(B2,"([a-z])([A-Z])","$1,$2")
=REGEXREPLACE(B2,"([a-z])([A-Z])","$1,$2")
in the above formula highlight comma (,) as separator and you can change to the desired format