Complex sentence: Munki is a collection of open-source tools used to manage installation of software packages on OS X client machines; it is typically used by admins who need to manage large numbers of OS X computers, typically in enterprise and education environments.
Split into simpler sentences: Munki is a collection of open-source tools used to manage installation of software packages on macOS client machines. It is typically used by system administrators who need to manage large numbers of macOS computers, typically in enterprise and education environments.