Learn Farsi: وظیفه‌ی خود این راهبر، جابه‌جایی مسافران در خط سراسری است. - The duty of this operator himself is moving passengers on the nationwide line.

To say "the [Noun] itself" or "the very [Noun]", Farsi places khod-e before the noun phrase. So while English says "this operator himself", Farsi structures it as khod-e in rahbar. The word khod acts as the head of the phrase and takes an ezafe to link to the noun.

How do the ezafes link the first part of the sentence together (vazife-ye khod-e in rahbar)?

There is a continuous ezafe chain linking the concepts: vazife-ye (the duty of) connects to khod-e (the very / himself), which connects to in rahbar (this operator). Notice that the demonstrative in breaks the ezafe chain, so in does not take an ezafe before rahbar.

How is the verbal noun jabejayi (moving) formed?

It is built from the phrase ja be ja, which literally means "place to place" (often used to mean moved, swapped, or shifted). Adding the suffix -i creates the noun jabejayi, meaning "relocation", "transfer", or "moving". It takes an ezafe here to link to the passengers: jabejayi-e mosaferan.

Why use the plural suffix -an for mosaferan (passengers) instead of the more common -ha?