ロメオはジュリエットが死んだと信じ、自殺しよう決心した。

Romeo, believing that Juliet was dead, decided to kill himself.

ロメオはジュリエットが死(し)んだと信(しん)じ、自殺(じさつ)しよう決心(けっしん)した。

Romeo wa Jurietto ga shinda to shinji, jisatsushiyou kesshinshita.

は (は)

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

が (が)

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

死ぬ (しぬ)

to die; to pass away; to lose spirit; to lose vigor; to look dead; to cease; to stop

と (と)

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

信じる (しんじる)

to believe; to believe in; to place trust in; to confide in; to have faith in

自殺 (じさつ)

suicide

決心 (けっしん)

determination; resolution

Readings: シ、し.ぬ、し.に-

Meanings: death, die

Reading: シン

Meanings: faith, truth, fidelity, trust

Readings: ジ、シ、みずか.ら、おの.ずから、おの.ずと

Meaning: oneself

Readings: サツ、サイ、セツ、ころ.す、 -ごろ.し、そ.ぐ

Meanings: kill, murder, butcher, slice off, split, diminish, reduce, spoil

Readings: ケツ、き.める、 -ぎ.め、き.まる、さ.く

Meanings: decide, fix, agree upon, appoint

Readings: シン、こころ、 -ごころ

Meanings: heart, mind, spirit, heart radical (no. 61)