彼らは知らせを聞いて喜んだ。

they (usually male); them

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

notice; notification

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to hear; to listen (e.g. to music); to ask; to enquire; to query; to learn of; to hear about; to follow (advice); to comply with; to smell (esp. incense); to sample fragrance

to be delighted; to be glad; to be pleased; to congratulate; to gratefully accept