Can anyone who knows Bosnian explain, please?

[Al-Indunisiy]

:salam2:

I found this on the Deutsche-Welle website in Bosnian and I found the Google translation to this sentence:

Optuženim komunistima izrečene su visoke zatvorske kazne.

as this:

Quote:

The accused communists imposed high prison sentences

What I want to ask is:
1. Why 'Optuženim komunistima' not 'Optuženi komunisti',
2. Why 'izrečene su' not 'izrečeni su',
and,
3. Is it 'visoke zatvorske kazne' because it is the object and is plural?