he remained there for a few months until the death of his friend and teacher and then returned to croton.

How would the previous sentence be correctly capitalized?
Answer: He remained there for a few months until the death of his friend and teacher and then returned to Croton.
the unit can automatically intercept and report signal interference.

How would the previous sentence be correctly capitalized?
Answer: The unit can automatically intercept and report signal interference.
borrell 32 can be reserved only if the booking start date is between 13 sep 2015 - 28 sep 2015

How would the previous sentence be correctly capitalized?
Answer: Borrell 32 can be reserved only if the booking start date is between 13 Sep 2015 - 28 Sep 2015
if you intend to install debian from the downloaded live image, be sure to have a look at the detailed information about the installation process.

How would the previous sentence be correctly capitalized?
Answer: If you intend to install Debian from the downloaded live image, be sure to have a look at the detailed information about the installation process.