QUESTION: Fix punctuation: Add a Tennis Charm to a necklace or sports charm bracelet to serve your collection with a little excitement
ANS: Add a Tennis Charm to a necklace or sports charm bracelet to serve your collection with a little excitement.

QUESTION: Fix punctuation: A manufacturer of high power led wall washer lww272p at GuangDong China
ANS: A manufacturer of high power led wall washer lww-2-72p at GuangDong China.

QUESTION: Fix punctuation: Then Oppenheimer again with another student showed that a neutron core would be strongly unstable
ANS: Then Oppenheimer, again with another student, showed that a neutron core would be strongly unstable.

QUESTION: Fix punctuation: The protest against the war became stronger and the number of victims of government persecution increased
ANS:
The protest against the war became stronger, and the number of victims of government persecution increased.