Add punctuation: The UN was founded on October 24 1945 on the ruins of the Second World War 51 countries committed themselves to keeping peace through international cooperation
A: The UN was founded on October 24, 1945, on the ruins of the Second World War. 51 countries committed themselves to keeping peace through international cooperation.

Add punctuation: Pinoydental Community and directory of Filipino dentists and dental students
A: Pinoydental - Community and directory of Filipino dentists and dental students.

Add punctuation: Due to the antivibration system the Donic table tennis bat Top Teams 600 concave provides a better ball control and better absorption of the ball
A:
Due to the anti-vibration system, the Donic table tennis bat Top Teams 600, concave provides a better ball control and better absorption of the ball.