QUESTION: Fix punctuation: The students worked together in groups
ANS: The students worked together in groups.

QUESTION: Fix punctuation: Details about an individual for Sandra RosenkranzJger
ANS: Details about an individual for Sandra Rosenkranz-Jager

QUESTION: Fix punctuation: Volunteer work is a central part of the youth program
ANS: Volunteer work is a central part of the youth program.

QUESTION: Fix punctuation: You now have a backup of your hftytfexerelated registry entry
ANS:
You now have a backup of your hftytf.exe-related registry entry.