今年は昨年より事故が減った。

今年は昨年より事故が減った。

There were fewer accidents this year than last.

今年(ことし)は昨年(さくねん)より事故(じこ)が減(へ)った。

Kotoshi wa sakunen yori jiko ga hetta.

今年 (ことし、こんねん)

this year

は (は)

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

昨年 (さくねん)

last year

より (より)

than; from; out of; since; at; on; except; but; other than; more

事故 (じこ、ことゆえ)

accident; incident; trouble; circumstances; reasons

が (が)

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

減る (へる)

to decrease (in size or number); to diminish; to abate

Readings: コン、キン、いま

Meaning: now

Readings: ネン、とし

Meanings: year, counter for years

Reading: サク

Meanings: yesterday, previous

Readings: ジ、ズ、こと、つか.う、つか.える

Meanings: matter, thing, fact, business, reason, possibly

Readings: コ、ゆえ、ふる.い、もと

Meanings: happenstance, especially, intentionally, reason, cause, circumstances, the late, therefore, consequently

Readings: ゲン、へ.る、へ.らす

Meanings: dwindle, decrease, reduce, decline, curtail, get hungry