成功したいなら、君はもっと努力しなければなりません。

If you are to succeed, you must try harder.

成功(せいこう)したいなら、君(きみ)はもっと努力(どりょく)しなければなりません。

Seikōshitai nara, kimi wa motto doryokushinakerebanarimasen.

成功 (せいこう)

success; hit

だ (だ)

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

君 (きみ)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

は (は)

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

もっと (もっと)

(some) more; even more; longer; further

努力 (どりょく)

great effort; exertion; endeavour; endeavor; effort

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

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: ド、つと.める

Meanings: toil, diligent, as much as possible

Readings: リョク、リキ、リイ、ちから

Meanings: power, strength, strong, strain, bear up, exert