Please capitalize where necessary: the ironman global trainer bodylink of timex proves to be a multi-function device used outdoor thanks to its gps-function.
A: The Ironman Global Trainer Bodylink of Timex proves to be a multi-function device used outdoor thanks to its GPS-function.

Please capitalize where necessary: this is not something that the user selects, the light will automatic step down to lower brightness.
A: This is not something that the user selects, the light will automatic step down to lower brightness.

Please capitalize where necessary: and the cherubim were lifted up. this is the living creature that i saw by the river of kebar.
A: And the cherubim were lifted up. This is the living creature that I saw by the river of Kebar.

Please capitalize where necessary: for 90 years, it has been clear that niacin is important to the nervous system and that severe niacin deficiency can cause dementia - as part of the deficiency disease pellagra.
A:
For 90 years, it has been clear that niacin is important to the nervous system and that severe niacin deficiency can cause dementia - as part of the deficiency disease pellagra.