Hopefully, you got the citation signed off when you corrected the tags. If you did, show the corrected ticket. If you did not, show the last registration card showing it was corrected. (BTW, don't drive to court) Not sure of what the policy of the traffic court is in Van Nuys, but many Los Angeles Courts will reduce the failure to appear fine (which is a new charge that is added when you don't show up and for which the fine is $75 plus penalty assessment), as well as reduce or eliminate the civil assessment that was also added.
The suspended license is probably from the failure to appear. Make the appearance, ask for a continuance and an abstract. The abstract will clear the license which in turn will make the vehicle registration possible. Waive Time. Don't worry about what it means, if asked, "Yes, I waive time" If the citation was not signed off, and you still have the original, take the registered vehicle to a sheriff's department and have them inspect it and sign the ticket off.
A proper response would require a thorough investigation into the history and background of this relationship. The information provided above is just that, information, to be used as you see fit.