# When it was decided

"When the king and the governor decided"

# sail for Italy

Italy is the name of the province Rome was in. See how you translated "Italy" in Acts 18:2.

# they committed Paul and some other prisoners to a centurion named Julius, who belonged to the Augustan company of soldiers.

"they put a centurion named Julius, of the Imperial Regiment, in charge of Paul and some other prisoners"

# they committed

Possible meanings are that 1) "they" refers to the governor and the king or 2) "they" refers to other Roman officials.

# a centurion named Julius

Julius is a man's name.

# the Augustan company of soldiers

Some versions translate the word Augustan as "Imperial" or "emperor's."