dato che pioveva, siamo

since it was raining, we...

→ dato
phrase Rare #43,701
since it was raining, we... Introduces a reason or circumstance. The phrase is usually followed by a past-tense verb; siamo is the beginning of the verb phrase, so the ending changes according to the sentence, such as siamo rimasti (we stayed) or siamo tornati (we returned).
IT: Dato che pioveva, siamo tornati presto.
EN: Since it was raining, we came back early.

Dato che pioveva, siamo rimasti a casa.

Since it was raining, we stayed home.

Dato che pioveva, siamo stati a casa.

Since it was raining, we stayed at home.

Dato che pioveva, siamo restate a casa.

Since it was raining, we stayed home.

Dato che pioveva, siamo state a casa.

Since it was raining, we stayed at home.