。
I went to the station to see a friend off.
Literal
Friend [object-を] see-off [purpose-に] station [toward-へ] went-and-came-back.
見送り ('seeing someone off') is a culturally weighted activity in Japan: family and friends often accompany travelers all the way to the station or airport gate. 行ってきました ('went and came back') captures the round-trip nuance — the speaker is back from the station, not still there.