Если бы адвокат не представил важно

Если бы адвокат не представил важного свидетеля, подсудимого бы приговорили к длительному тюремному заключению.

Results (English) 1:

If counsel has not submitted an important witness, the defendant would be sentenced to long prison terms.

Results (English) 2:

If an attorney has not presented an important witness, the defendant would have been sentenced to long prison terms.

Results (English) 3:

if the lawyer presented an important witness, the defendant would be sentenced to a long prison term.