1.1)
VGS → VCS
to switching → to switch
in storage system → in a storage system
good in tracking → good at tracking
central sever → central server
In a localized version control systems → In a localized version control system
In a centralized version control systems → In a centralized version control system
Both system makes it also harder → Both systems also make it harder
distributed version control system have been → distributed version control systems have been
The decision which → The decision regarding which

2.2)
an user → a user
locally files → local files

2.4)
allows you to on → allows you to work on

2.5) each commit knows their parents → each commit knows its parents
This {contentidentifier} → I think this is a variable that needs expansion. "This document" maybe?

3.1)
online → inline
See all possible commands → To see all possible commands
two hyphen → two hyphens

3.3)
build-in → built-in