QUESTION: Fix punctuation: With Penneo the system itself manages to keep track of who to sign when and when
ANS: With Penneo, the system itself manages to keep track of who to sign when and when.

QUESTION: Fix punctuation: A sinusoidal quantity having a frequency that is an integral multiple 2 3 etc of a fundamental 1 frequency
ANS: A sinusoidal quantity having a frequency that is an integral multiple ('2, '3, etc.) of a fundamental ('1) frequency.

QUESTION: Fix punctuation: Debians Security Team recently released advisories for these packages among others apache2 icedove cvs php5 devscripts and libpng
ANS: Debian's Security Team recently released advisories for these packages (among others): apache2, icedove, cvs, php5, devscripts and libpng.

QUESTION: Fix punctuation: 50 cc machines back then were not specialized speedway bikes but street bicycles fitted with small engines and the riders were not teenagers but adults fully equipped in leather suits The top speed has been about 30 to 35 kph
ANS:
50 cc machines back then were not specialized speedway bikes, but street bicycles fitted with small engines, and the riders were not teenagers, but adults fully equipped in leather suits. The top speed has been about 30 to 35 kph.