NOUN + を通して as “through NOUN”
When the phrasing を通して follows after a noun word, it establishes the noun as a medium through which the following verb statement occurs. The noun word itself can be any number of things, including people, events, activities, and even actions.
Internet o tooshite fuku o kau hito ga sukunakunai.
(There are a lot of people who buy clothes through the internet.)
Bukatsudou o tooshite takusan no hito to tomodachi ni natta.
(I became friends with a lot of people through extracurricular activities.)
Kono tokoro wa tomodachi o tooshite kiita.
(I heard about this place via a friend.)