もう一度試していれば、彼は成功していたであろう。

Had he tried it once more, he would have succeeded in it.

もう一度(いちど)試(ため)していれば、彼(かれ)は成功(せいこう)していたであろう。

Mōichido tameshiteireba, kare wa seikōshiteita de arou.

もう一度 (もういちど)

once more; again

試す (ためす)

to attempt; to test; to try out

彼 (かれ)

he; him; his; boyfriend

は (は)

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

成功 (せいこう)

success; hit

だ (だ)

be; is; indicates past or completed action; indicates light imperative

或 (ある)

a certain ...; some ...

Readings: イチ、イツ、ひと-、ひと.つ

Meanings: one, one radical (no.1)

Readings: ド、ト、タク、たび、 -た.い

Meanings: degrees, occurrence, time, counter for occurrences, consider, attitude

Readings: シ、こころ.みる、ため.す

Meanings: test, try, attempt, experiment, ordeal

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: セイ、ジョウ、な.る、な.す、 -な.す

Meanings: turn into, become, get, grow, elapse, reach

Readings: コウ、ク、いさお

Meanings: achievement, merits, success, honor, credit