How can I delete infinitely repeating single calendar events on Google Calendar?

I helped my father import his calendar from his old Nokia to a new iPhone using google calendar. In doing this, apparently, recurring events became single events that repeat for ever and this annoys him greatly as things he doesn't need to do anymore make a sound every day. He needs to keep the rest of the events and delete infinitely repeating single events for good.

You and your father both are living in cave period because taht is easy to do, just remove all dating memos in calendar with ugly girls and everything will be ok.