Past tense, third person plural, passive voice. 过去式, 第三人称复数, 被动语态.
We make the passive voice by adding "be" to the third form of the verb, and conjugating "be" in the tense of the original sentence.
I ate food=我吃了饭。
The food was eaten by me=饭被我吃了。
No one took them seriously=无人往心里去 他们说的话。
They were not taken seriously=他们说的话被无人往心里去。