一行は、彼が到着するとまもなく出発した。

The party started soon after his arrival.

一行(いっこう)は、彼(かれ)が到着(とうちゃく)するとまもなく出発(しゅっぱつ)した。

Ikkō wa, kare ga tōchakusuru to mamonaku shuppatsushita.

一行 (いちぎょう、いっこう)

line; row; troupe; party

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

彼 (かれ)

he; him; his; boyfriend

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

到着 (とうちゃく)

arrival

と (と)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

間もなく (まもなく)

soon; before long; in a short time; lacking time to ...; without time to ...

出発 (しゅっぱつ)

departure

Readings: イチ、イツ、ひと-、ひと.つ

Meanings: one, one radical (no.1)

Readings: コウ、ギョウ、アン、い.く、ゆ.く、 -ゆ.き、 -ゆき、 -い.き、 -いき、おこな.う、おこ.なう

Meanings: going, journey, carry out, conduct, act, line, row, bank

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: トウ、いた.る

Meanings: arrival, proceed, reach, attain, result in

Readings: チャク、ジャク、き.る、 -ぎ、き.せる、 -き.せ、つ.く、つ.ける

Meanings: don, arrive, wear, counter for suits of clothing

Readings: シュツ、スイ、で.る、 -で、だ.す、 -だ.す、い.でる、い.だす

Meanings: exit, leave, go out, come out, put out, protrude

Readings: ハツ、ホツ、た.つ、あば.く、おこ.る、つか.わす、はな.つ

Meanings: departure, discharge, publish, emit, start from, disclose, counter for gunshots