Criminal Law Questions? Ask a Criminal Lawyer.
The maximum penalty for PC 29800(a)(1) is three years incarceration. PC 667.5(b) is not a separate offense but a sentencing enhancement for prior felonies. It means that if the person receives any jail time for the PC29800 conviction, then the court must impose 1 additional year of jail consecutively for each prior felony conviction on the person's record. So if they receive 2 years on the first charge and have one prior felony, the sentence would be 3 years.
There's no way to know for sure what the sentence will be because it depends on a lot of factors like prior record, the temperament of the judge and the prosecutor, etc. But that is the general outline of what the person is looking at.