What kind of verb phrase is it when “is” in the present tense is immediately followed by another verb that’s itself in the past tense?

Please con­sider this ex­am­ple of three sen­tences in se­quence:

1. The build­ing is de­stroyed.
2. The rub­ble is then re­moved.
3. The rub­ble is bro­ken into smaller pieces.

What kind of verb phrase is it when I fol­low is with yet an­other
in­flected verb, and why do we call it that?

I think it’s still present tense but I can’t fig­ure out how is
can be used with a past-tense verb. I know that is is the verb,
and thus it is present tense, but what would de­stroyed be? An
ad­jec­tive?

Also, based on the first two sen­tences’ pat­tern,
shouldn’t the third sen­tence use broke not bro­ken so that
it is also in the past tense just like de­stroyed and re­moved
had been?

3. The rub­ble is broke into smaller pieces.