perché erano in ritardo

why they were late

→ perché
phrase Rare #42,668
why they were late Used in reported speech or after verbs like spiegare and dire. Literally, "because they were late" can be confusing here; the natural English meaning is "why they were late."
IT: Non mi hanno detto perché erano in ritardo.
EN: They didn’t tell me why they were late.

Hanno spiegato perché erano in ritardo.

They explained why they were late.

Mi dissero perché erano in ritardo.

They told me why they were late.

Non hanno mai spiegato perché erano in ritardo.

They never explained why they were late.

Mi hanno detto perché erano in ritardo.

They told me why they were late.