女の子達は怖がらなかったが、男の子達は怖がった。

The girls were not afraid, but the boys were.

女(おんな)の子達(こたち)は怖(こわ)がらなかったが、男(おとこ)の子達(こたち)は怖(こわ)がった。

Onnanokotachi wa kowagaranakatta ga, otokonokotachi wa kowagatta.

は (は)

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

怖がる (こわがる)

to be afraid of; to fear; to dread; to be nervous (about); to be shy (of)

が (が)

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

Readings: ジョ、ニョ、ニョウ、おんな、め

Meanings: woman, female

Readings: シ、ス、ツ、こ、 -こ、ね

Meanings: child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac

Readings: タツ、ダ、 -たち

Meanings: accomplished, reach, arrive, attain

Readings: フ、ホ、こわ.い、こわ.がる、お.じる、おそ.れる

Meanings: dreadful, be frightened, fearful

Readings: ダン、ナン、おとこ、お

Meaning: male