〜を通じて・〜を通して
through, via; throughout
Noun + を通じて / を通して
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を通じて and を通して have two meanings.
Through, via: a person, a medium or an experience that connects or teaches you: 友人を通じて彼女と知り合った, "I met her through a friend"; 仕事を通して多くのことを学んだ, "I learned a lot through my work".
Throughout a period: この地域は一年を通じて暖かい, "this region is warm all year round".
The two are largely interchangeable. を通して is a little more common for deliberate means (through a secretary, through practice); を通じて for connections and channels (through the internet, through a friend).
Compare によって, "by (means of)", which is more about method than channel.
Examples
友人を通じて、彼女と知り合った。
I got to know her through a friend.
この地域は一年を通じて暖かい。
This region is warm all year round.
インターネットを通じて、世界中の人と話せる。
Through the internet, you can talk to people all over the world.
仕事を通して、多くのことを学んだ。
I learned a lot through my work.
秘書を通して、社長に連絡した。
I contacted the president through their secretary.